OxyLED OxySense D01 Door Bell, 4 in 1 Wireless DoorBell Kit, 1 Remote Button with Blue LED Indicator and 1 Reciever, Operating at Over 500-feet Range with 36 Chimes Joins the Millions of Trusted OxyLED Users Around the World 4 in 1 DOORBELL KIT: A push button(transmitter) and a door chime(receiver) with function of wireless doorbell, security burglar alarm, motion sensor light and emergency flashlight, support wireless range up to 150m 36 CHIME OPTIONS & 3 VOLUME SETTINGS: Customize your doorbell effortlessly. Select from 36 chime options and 3 volume settings with the ability of code learning system across multiple entrance transmitters and receivers. EASY TO INSTALL & USE: Simply stick it where needed, using the double-sided adhesive tapes within minutes. Does not require any wires or screws. RELIABLE AND FRIENDLY CUSTOMER SERVICE: ready to respond within a 24 hour time frame and Lifetime Support.