... ,use battery,30-50M remote range,OEM wireless door bell,digital doorbell,door chime,factory low price,flashing ... while belling;Built-in 10pcs Musics for option;Receiver flashes in 7 colors continuously for 15 seconds ... " Battery for Transmitter, 3 "AA" Battery for Receiver;Battery Stand-By Time: 3-6 Months;ABS Environmental ... :Transmitter Size: 7.5*4.0*2.0CM Receiver Size: 9.0*6.2*3.3CMStandard Neutral ...