The byron smartwares ib71 hands free wired audio door intercom has no additional telephone connected to the wall but a small box leaving both hands free whilst your talking allowing you to operate the panel easily the metal outdoor post is durable and protected thanks to its built in rain shield the external unit is also equipped with a microphone and speaker so you can communicate back and forth the volume is manually adjustable the standard eight metre cable can be extended up to 30 metres onc