wireless door bell,digital doorbell,door chime,factory low price,flashing while music sound,use battery,30-50M remote range,OEM wireless door bell,digital doorbell,door chime, ... while belling; This doorbell is very convienent for people with hearing problems;Use 1 "AAA" Battery for Transmitter, 3 ... Customerized Logo/Color acceptable. Package:Transmitter Size: 7.5*4.0*2.0CM Receiver Size: 9.0*6.2 ...