This product is a vibration alarm with doorbell function. It can be used as a doorbell at home during the day, but no one can be used as a burglar alarm at home and at night.Features:Easy to install, no wirings required, saving installation cost and time.Efficient and energy-saving, and the battery replacement is convenient. The standby time of only two ordinary No. 7 batteries can be as long as 2 years, eliminating the trouble of changing batteries frequently.With the unique learning technology of coding chip, the functions of one remote control multi-host and multi-remote control one host can be realized.Easy to install and stick in the concealment of doors and windows. When thieves touch doors and windows, the alarm host will ring up to 105 decibels (the alarm can last up to 30 seconds) to inform the owner, while scaring away thieves.When someone is at home during the day, it can be set as a doorbell function. When a visitor knocks on the door, the host will send out a loud tinkling sound to remind the host that there is a visitor to visit.Specifications:Host: 2pcs AAA (No.7) Alkaline Batteries (Included)Remote Controller: 1pcs 12V/27A Alkaline Battery (Included)Working ambient temperature: - 10 ~60Humidity of working environment: <80%Storage temperature: - 20 ~70 Receiver Size: 8.5*4.3*1.3cm/3.3*1.7*0.5inPackage Weight: 63g/2.3ozPackage List:1 * Alarm (Batteries Included)1 * Remote Control (Battery Included)2 * Screw1 * User Manual