door bells many sound selectable. wireless doorbell distance 50M, A.B.C.D.E digital code,

normal doolbell

wireless doorbell

 receiver 3pcs AA battery,

transmitter

1pcs DC12V battery  OR 6 pcs AG-13 battery,

remote distance 30M,

A.B.C.D.E digital code,

16 melody selectable OR ding-dong sound

CE (EMC ), R& TTE, ROHS certification

DOORBELL