Best 4 Frequency Alarm System

ChunHee Wireless Driveway Alarm System, 1/2 Mile Long Range Waterproof Motion Sensor Solar Security Alert System with Remote Outdoor (2 Sensors + 1 Receiver)

  • ▶【Solar Driveway Alarm System】: Solar wireless alarm warning system can detect the movement of people, vehicles and large animals. When the wireless mobile lane warning system detects movement, it will emit a loud enough warning sound and flash. The receiver also emits sounds and flickers..
  • ▶【4 Working Modes】: ①24 hours - Sensor flash and perimeter alarm + wireless doorbell alert ②At night 12 hours - Sensor flash and perimeter alarm + wireless doorbell alert ③24 hours - Sensor no flash and no alarm + wireless doorbell alert ④At night 12hours - Sensor no flash and no alarm + wireless doorbell alert. Working modes can switch by remote control or power button..
  • ▶【Long Range Sensing Receiving】: Through detection, the sensing distance of the driveway sensor is about 5-8m (16.4~26.25 feet),The horizontal sensing angle is 70°.The longitudinal sensing angle is 30°.The remote control and receiver distance is about 975 feet in open area.The angle of the solar alarm can be adjusted arbitrarily..
  • ▶【Adjustable Alarm System】: A remote control can be paired with multiple solar-powered lane sensor alarms. In addition, a wireless receiver doorbell can also be matched with multiple solar-powered wireless lane alarms. You can choose a dif....
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Gain Express Landtek Instruments Professional Digital Sound Level Meter 30 to 130db with Bluetooth

  • Standardisation: IEC651 Type 2, ANSI S1. 4 Type 2.
  • Function: Lp, Leq, Lmax, LN. with Frequency range: 20.0 to 12,500Hz.
  • Frequency range: 20.0 to 12,500Hz / Frequency weighting: A, C and F (Flat).
  • Alarm: electron, adjusable, 30-130dB set, LED and optional relay contact (NC) output.
  • Built-in calibration signals: 94dB at 1kHz (sinusoidal).
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Retevis H-777 2 Way Radio Flashlight Rechargeable Handheld Radio 16CH Walkie Talkies with Speaker Mic (4 Pack)

  • 1 year warranty and 30 days no reason to returnDescriptionNew Version New Features.
  • USB charging base and adapter provides you more convenient charging.
  • Especially when you need to work outside.
  • Support PC software programmable and Chinese and English voice prompt.
  • Speaker mic and earpiece allow you not need to hold the radio.
  • Twin right angle: Ear 3.5mm stereo (top pin).
  • BF-888S, BF-UV5R, BF-UV5RA, BF-UV3R, BF-666S, BF-777S, KPG27D, KPG29D, KPG48D, KPG49, KPG55D, KPG56D, KPG62D, KPG66D, KPG69D, KPG70D, KPG74D, KPG75D, KPG77D, KPG82D, KPG87D.
  • TK-208/308, TK-220/320, TK-240/340, TK-240D/340D, TK-248/348, TK-250/350/353, TK-260/360, TK-260G/360G, TK-270/370, TK-270G/370G, TK-272G/372G/373G, TK-278G/378G/388G Pro-Talk, TK-430/431, TK-2100/3100 Pro-....
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Alarm System for Home Security, GRSICO Wireless Home Alarm Kit 9 Piece, WiFi Alarm System Sensor for Door and Window, Motion Sensor, Remote, Keypad, DIY WiFi Alarm Siren, Works with Alexa, No Contract

  • GRSICO WIRELESS ALARM SYSTEM: A great do-it-yourself alarm system fit to protect your house. The smart WiFi alarm 9-piece kit includes 1 alarm siren station, 1 keypad, 4 windows & door sensors, 1 motion detector, and 2 remote controls..
  • Easily DIY Installation: Set up the alarm system in minutes all by yourself making home security easier. The entry sensors attach to doors and windows, while the motion sensor can be secured to walls via the included mounts..
  • Remote Control: Wherever you are, you can control and monitor your smart alarm system on the Smart Life App anytime, such as arm/disarm your home remotely, and personalized Entry, and Exit Delay. A great way to get started in whole-home protection for your house or apartment..
  • Early-Warning Notifications: Receive real-time early-warning notifications in the form of smartphone banner alerts, limited SMS/text messages, and calls(add-on values) to deter burglars successfully and always give you peace of mind..
  • Easily Expandable: Supports up to 20 sensors and 5 remotes. Add additional entry sensors, motion sensors, keypads, and more to GRSICO alarm system to quickly and easily expand your entire home protection to suit the size and layout of your home..
  • Hands-Free Voice Control: GRSICO wireless alarm....
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Driver Fatigue Alarm, 60° Wide Angle Security Anti-Sleep Alarm Monitor, USB Driver Alertness System with Suction Cup Buckle, 45-65cm Detection Distance, for Drivers Security Guards, Safe Driving

  • 【INTELLIGENT FACE READING DETECTION TECHNOLOGY】Using the image sensor to catch the infrared image of the human face, and analyze and confirm it through the high‑speed digital signal processor. Through face recognition, blinking, blinking frequency and real‑time detection, voice warnings and alarms to calculate, judge and determine whether the driver is driving safely..
  • 【ALARM IN TIME】This driver alertness system's detection distance is about 45-65cm / 17.72-25.59in (±5cm / 2.0in). When the driver is fatigued, prompt an alarm in time, when distracted driving (look around), alarm and alarm response time 1-2 seconds after closing your eyes. Send reminders and alarms to the driver in real time to guarantee the safety of the driver's life and property..
  • 【WIDE APPLICATION】This car fatigue driving warning device with rotating ball sucker bracket, can connect the device to any plane and can be used on all types of vehicles. Suitable for advanced drivers, drivers and truck drivers to make sure safe driving..
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PHILIPS Digital Alarm Clock Radio for Bedroom FM Radio, LED Display, Easy Snooze, Sleep Timer, Battery Back up (Batteries Sold Seperately)

  • FM RADIO ALARM CLOCK FOR BEDROOM- Easy digital tuning in FM radio with 0-15 level volume adjustable. Digital FM radio offers you additional music options to your music collection on your Philips audio system. Simply tune into the station that you want to preset press and hold the preset button to memorize the frequency.
  • SLEEP TIMER FOR EASILY FALLING ASLEEP WITH YOUR FAVORITE MUSIC - Sleep timer lets you decide how long you want to listen to music or a radio station of your choice before falling asleep. Simply set a time limit (up to 1 hour) and choose a CD or radio station to listen to while you drift off to sleep. The set will continue to play for the selected duration and then automatically switch off to a power-efficient silent stand-by mode.
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LEEPEE Bluetooth 5.0 Tire Pressure Monitoring System, 5 Alarm Modes, with 4 External Sensors TPMS, Support iOS and Android, Real-time Displays Pressure and Temperature (0.1-6.4Bar)

  • 【 Multiple alarm types 】 Bluetooth5.0 Tire Pressure Monitoring System provide five types of alarms include quick/slow leak alarm, High voltage alarm, High-temperature alarm and low battery alarm. Users can set the pressure, temperature and battery alarm values.
  • 【 Operating System 】 The Tire Pressure Monitoring System is designed for Smartphone, just connect your smartphone with APP"TPMSII" for IOS and Android. Bluetooth 5.0 with a high-speed connection, stable transmission, accurate data, Longer Acceptance Distance..
  • 【Easy installation and disassemble 】 1, Scan QR code on the card, then download and install. 2, Please follow the sensor's mark and install the sensor on the corresponding tire until getting each sensor date The installation is complete. please install slowly to make the air pressure fully contact the sensor. (The pressure range that can be set is 1.5~92.6Psi, 0.1~6.4Bar.).
  • 【4 Tire external sensors 】 Dynamically monitor tire pressure on 4 wheels at the same time, prevent damage from a flat tire, Improve fuel efficiency, prolong tire life span, During travel, tire pressure and temperature displayed in real-time and send an alert when statistics' abnormal..
  • 【 Necessary alarm system 】 The Bluetooth external TPMS sensors are ....
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DENFOON WiFi Home Security System Kit 8-Piece (2.4GHz), with 2 Remote Control, 5 Door Window Sensors, 1 Motion Detector Alarm Host, Compatible with Alexa and Google Assistant

  • 【8-piece WiFi home security system kit 】The package includes 1 motion detector alarm host , 5 door alarm sensor, 2 remote control. The motion detector alarm host connects with 2.4GHz WiFi Router and the door alarm sensor connects with the motion detector alarm host..
  • 【Work with Alexa & Google Assistant】 Our home security system is compatible with Alexa and Google Assistant, very convenient to use..
  • 【Real Time Alerts】When the door or window are opened or unexpected motion is detected, the alarm host will make a sound up to 110dB and send a notification to your phone by tuya app, giving you a lot of peace of mind when you aren't home..
  • 【DIY Home Security System 】There are armed, disarmed and home modes that you can choose, also you can change detailed settings according to your needs by app,such as delay the alarm, name the alarm sensor.
  • you can control the system by remote controller too..
  • 【With PIR】The host can work as a motion detector with PIR. What’s more, the area of the detector is cylindrical, will effectively decrease the false positive rate..
  • 【 No subscription Fees】Denfoon home security system is one-time purchased, no more other monthly fees needed, saving you money..
  • 【Backup Battery and Low Battery Alert】The motion d....
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Dynaudio Esotan System 372 6-1/2" 3-Way Component Speakers

  • Features: Three-way system, 6.5in MSP woofer, 1.1in soft-dome tweeter, 3in MSP midrange, Frequency response: 40Hz – 20kHz, and System impedance: 4-ohm..
  • MF172 Woofer: Nominal Impedance: 4-Ohm, Recommended Frequency Range: 40-4000Hz, Power Handling: 120W RMS | 1000W Transient. Total Diameter: 6.85", Mounting Diameter: 5.31", Mounting Depth: 2.63"..
  • MF171 Midrange: Nominal Impedance: 4-Ohm, Recommended Frequency Range: 160-14000Hz, Power Handling: 120W RMS | 1000W Transient. Total Diameter: 3.93", Mounting Diameter: 2.97", and Mounting Depth: 1.69"..
  • MT171 Tweeter: Nominal Impedance: 4-Ohm, Recommended Frequency Range: 1300-20000Hz, Power Handling: 120W RMS | 1000W Transient. Total Diameter: 2.48", Mounting Diameter: 2"-2.18", and Mounting Depth: 1.13"..
  • X372 Crossover: Crossover Frequency: 500Hz/3600Hz, Nominal Impedance: 4-Ohm, Power Handling: 200W (MF172), and Dimensions: 1.69" x 4.09" x 6.89"..
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DENFOON WiFi Home Security System Kit 5-Piece (2.4GHz), with 2 Remote Control, 2 Door Window Sensors, 1 Motion Detector Alarm Host, Compatible with Alexa and Google Assistant

  • 【5-piece WiFi home security system kit 】The package includes 1 motion detector alarm host , 2 door alarm sensor, 2 remote control. The motion detector alarm host connects with 2.4GHz WiFi Router and the door alarm sensor connects with the motion detector alarm host. WiFi range 260ft without obstacles..
  • 【Work with Alexa & Google Assistant】 Our home security system is compatible with Alexa and Google Assistant, very convenient to use..
  • 【Real Time Alerts】When the door or window are opened or unexpected motion is detected, the alarm host will make a sound up to 110dB and send a notification to your phone by tuya app, giving you a lot of peace of mind when you aren't home..
  • 【DIY Home Security System 】There are armed, disarmed and home modes that you can choose, also you can change detailed settings according to your needs by app,such as delay the alarm, name the alarm sensor.
  • you can control the system by remote controller too..
  • 【With PIR】The host can work as a motion detector with PIR. What’s more, the area of the detector is cylindrical, will effectively decrease the false positive rate..
  • 【 No subscription Fees】Denfoon home security system is one-time purchased, no more other monthly fees needed, saving you money..
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