Features: 1.Multi Purpose: Infrared detector alarm is not only suitable for doorbell, but also can be used as a wireless burglar alarm in garage, hallway and other places. 2.Separate Design: Infrared motion sensor alarm utilizes separate receivers and transmitters for easy installation and better signal reception. 3.Waterproof Design: Anti theft alarm is waterproof, which is suitable for outdoor use, no need to worry about rainy weather or water splashing wet doorbell. 4.38 Music Options: Home security alarm offers a diverse selection of music options, allowing you to switch between your favorite music as you wish. 5.High Efficiency and Power Saving: Wireless alarm adopts advanced sensing technology and low power consumption design, which can be used for a long time without frequent battery replacement. Specification: Item Type: Infrared Detector Alarm_x000D_ Material: ABS_x000D_ Size:_x000D_ Receiver: Approx. 80x76x33mm/3.1x3x1.3in_x000D_ Transmitter:Approx. 90x80x53mm/3.5x3.1x2.1in_x000D_ Transmitter: Battery Type: Lithium battery, Battery Type: 1.5VAAAx3 Ships without battery_x000D_ Operating Frequency: 433MHZ_x000D_ Receiver Buttons:_x000D_ 1) Music: 38 music to choose from, the side of the music sign button for adjustment_x000D_ 2) Volume: Three volume adjustments (high, medium, low) side of the volume sign button for adjustment_x000D_ 3) Can be set sound and silent (sound: sound + indicator light silent: indicator light)_x000D_ Working Distance: Approx. 100 meters/328ft_x000D_ Transmitter Sensing Distance: Approx. 7 meters/23ft PackageList: 1 xTransmitter 2 xReceivers 1 xConnector 1 xBase 2 xScrews 2 xExpansion Screws 1 xEnglishInstructionManual