1、Indoor Outdoor Use: Waterproof design, suitable for both indoor and outdoor environments, capable of withstanding various weather conditions. 2、Anti Theft Alarm: Built in anti theft alarm system increases home security, ensuring the protection of your belongings. 3、Personalized Settings: 38 music options are available, support three levels of volume adjustment, can be set with sound and silent. 4、Wide Application: Split installation design, suitable for garages, hallways, and driveways, making installation and use convenient. 5、Easy Install: Wireless connection eliminates the need for complicated wiring, providing greater flexibility and convenience. Item Type: Motion Sensor Doorbell Material: ABS Receiver Size: Approx. 80x76x33mm/3.15x2.99x1.30in Transmitter Size: Approx. 90x80x53mm/3.54x3.15x2.09in Transmitter Battery: 1.5V AAA lithium battery x3 Working Frequency: 433MHZ Receiver Button: 2) Volume: Three level volume adjustment (high, medium, low) side volume logo button to adjust 3) You can set sound and silence (sound: sound + light, silent: light) Working Distance: Approx. 100m/328ft Transmitter Sensing Distance: Approx. 7m/22.97ft 1 x Transmitter 2 x Receiver 1 x Connector 1 x Base 2 x Screw 2 x Expansion Bolt 1 x Instruction Manual