Check the listing for details. Door Open Chime Wireless Door Sensor Alarm Contact Kit 48 Melodies with 2 Sensor. Color: White, Condition: New, Made in China. Listed at 24.94 USD. Features: -Up to 10-Year battery life. -Low power consumption of receiver. -48 chimes for your choice. -5 volume levels from 0-97dB (included silent mode). -Receiver designed with night light function. -7 adjustable brightness for night light function (included OFF mode). -Up to 1300ft (400m) wireless range in open area. 131~262ft (40m~80m) wireless range indoor with obstacles. -Support DIY pairing, add up to 32 additional wireless infrared sensors /doorbell buttons/ magnetic sensors/ to your own alert system. -Smart memory function, no need to configure doorbell settings (Chimes, Volume, Lightness) again if unplugged. -Music rhythm flashlight on receiver (bright light flash when the doorbell is pressed, no matter it is with volume up or in silent mode/ night light mode).