Feature:1. Motion Sensor Doorbell: Smart chip, 46 meters inductive distance; available dry battery (not included) or USB charging (one charge can be used for 35 months).2. Volume Adjustment: Weak/medium/strong three level volume can be adjusted, high volume; a variety of pleasant ringtones can be switched at will.3. Personalized Voice Recording: Global voice recording and broadcasting, long press to open the recording mode and enter a specific voice.4. Wide Application: Motion sensor doorbell is used in homes, apartments, shops, supermarkets, as well as the elderly, the sick, pregnant women, etc.5. Easy Installation: Magnetic installation, hole free installation, with adhesive backing, can be installed in any position to meet your different needs.Specification:Item Type: Motion Sensor DoorbellMaterial: ABSPower Supply Mode: 5V 1AWorking Current: Sleep standby state 100uAPlayback status 300mA (DC5)Audio Format: MP3Bit Rate: 8-320KbpsAudio Output Power: 8/1W (typ.)Infrared Sensing Range: 4m (120 viewing angle)Batteries: 3 x AAA (not included).Package List:1 x Doorbell1 x Iron Sheet Adhesive1 x ManualNote:1. Do not place the product in an environment that is too corrosive, humid and high temperature!2. Please supply power according to the voltage used. Using other voltages may cause fire and product damage!