Wireless Doorbell Operating at 900 Feet Long Range with 48 Chimes Tones, No Battery Required for Receiver Doorbell kit of 1 push button and 1 chime supports a wireless range of up to 900 feet / 280 m. Offers a total of 48 chime tones, including the traditional Ding Dong, and 4 levels of sound volume FCC, CE and RoHS certified; IP44 rated push button(transmitter) is splash proof and is painstakingly made to withstand rain, wind and other weather elements A specially designed coding system ensures there is no interference to or from any nearby wireless products. Anti-harassment design, one by one ringing. Blue LED flashes when someone is at the door; sleek design easily blends with the decor of your home Easy installation. Push button can be fixed to the door frame with the screws provided, or attached to the wall using double-sided adhesive tapes outlet in your home