LASHING LIGHT HINT When push the wireless doorbell transmitter button, it will flash blue light at the ring area. The doorbell receiver will flash blue light correspondingly. Besides, the push button is rated IP44 and weatherproof for outdoor or indoor use. 52 DIFFERENT RING TONES The chime unit allows you set different ringtones easily as you like. The sound quality is much better than normal ones in the market. 4 Levels of adjustable volume from 25db-110db. LONG WIRELESS RANGE Operating at 1000 feet (300 Meters) in open area. It also can easily penetrate walled barriers. EASY INSTALLATION -- Plug-in receiver (No Batteries Required) with 2-Pin US plug is suitable for an electrical outlet (AC). Affix the Push Button Transmitter to the wall with the provided screws/anchors, or stick it to the wall by using the enclosed double-sided adhesive tapes. WHAT YOU GET -- 1X Remote Push Button Transmitter, 1 X Plug-in Doorbell Receiver, 2 X Screws, 1 X Double-Sided Adhesive Tape, 1 X 23A Battery, 1 X Instruction Manual and our fan-favorite 12-month warranty and friendly customer service.