Pro Intercom HH10AB Intercom Handset with Passive Cradle - BlackThe HH10A consists of the handset with push to talk switch, equipped with a US made coil cord and 4 pin XLR connector, and a wall mount cradle with retaining spring clip. The HH10B consists of the same handset, coil cord and cradle, but the coil cord is wired to the cradle which contains a hook switch to mute the earspeaker when the handset is "hung up". A ten foot cable is wired to the HH10B cradle, with a 4 pin XLR connector for connection to an