【4 Modes & Adjustable Volume】Remote control door magnet has 4 modes, which are SOS mode, doorbell mode; and two alarm modes. More Volume to Choose (Alarm HI> 100dB; LO>90dB; Doorbell HI> 95dB; LO>85dB) Remote door magnet can make sure that you can hear the sound near your home. 【300 FEET WORKING RANGE】The door sensor alarm has a wireless range of up to 300 feet for flats, villas, homes, offices, factories and classrooms. Ensure you won't miss visitors, even if you are several rooms away or on another floor. Please do not install this doorbell on metal objects (such as metal doors or windows), as it will interfere with the wireless signal and shorten the working distance between the transmitter and receiver. 【Working Principle】 These open alarm sensor come with a magnetic stripe, and when the magnetic stripe is separated by more than 1.5cm, the receiver will automatically trigger the magnetic stripe. The receiver will immediately play one of the bells to alert the person in charge. (Note: If the alarm does not work, please check if it is in off mode or if the batteries need to be replaced) 【Widely Used】 The compact magnetic window alarms is beautifully designed and suitable for all types of homes. Application Scenarios: prevent burglars from entering, prying windows, preventing children from approaching cabinets, in-ground swimming pools, preventing the elderly from getting lost, sleepwalking and so on. Will provide great convenience for your life. 【All-Purpose Security Alarm】 Stop break-ins (doors/windows), prevent child accidents (hazardous cabinets/dangerous areas), secure pool areas, and monitor elderly wanderings - all with one discreet, remotely controllable doorbell system that works where you need protection most. 【36 Months Warranty】If you encounter any problems during use, please feel free to contact our professional customer service team to enjoy TECKNET 36 months warranty service (registered users only)., Weight: 0.07 Pounds, Manufacturer: TECKNET