5 Model Welcome Languages and 36 Ringtones: you can choose your favorite ringtone for your home or Store. 4 Level Volume Adjustable:Welcome/Doorbell/Alarm Model has 4 level volume adjustable 113-25dB.So you don t need to worry about the volume is too loud or too small. 4 Brightness and Color Selectable:Color light or Lighting mode is Silent and has 4 levels of brightness adjustable. You can choose these two modes when you don t want to be disturbed by the ringtone. The color light model also has 4 colors selectable You can set different colors for different doors. Expandable Wireless Home Security:Each receiver of this motion sensor detects alarm can work with 32 Infrared transmitter/ Magnetic sensor and 8 Remotes at most. Wide Wireless Range:Open places Working Range up to 280m/918ft between the receiver and Infrared transmitter. detection range of the infrared sensor approximately 4-8m/13-26ft. If the device s working distance becomes shorter please replace the battery or recharge it in time. Memory Function:Remember your last set melody and volume level after power off then don t need to reset to your previous settings again. Wide Applicable:Very suitable for all kinds of shops upscale clubs hotels offices factories homes banks store garage supermarket boutique villas mailbox and so on.Can be used as a doorbell during the day and converted into an anti-theft alarm at night. 5 Modes Switchable:1 Welcome 2 Doorbell 3 Alarm 4 Color Light Lighting Model 5 modes cyclically switch Receiver Power Supply: Micro USB (not included) or AA alkaline battery x 3 (not included) Infrared Transmitter Power Supply: Micro USB (not included) or AAA alkaline battery x 3 (not included) Working temperature: -14-90 F Transmitter detection angle: up and down 360 degree left and right 360 degree