wireless doorbell,remote doorbell,door chime,battery operated,factory hot sales item,25pcs-Melody optional,chime ... in 8 languages wireless doorbell,remote doorbell,door chime,battery operated,factory hot sales item,25pcs-Melody optional,chime in ... is adjustable;Use 1 "AAA" Battery for Transmitter;Use 3 "AA" battery for Receiver;Battery Stand-By Time: 3-6 Months;ABS Environmental Material,conform ...