Pro Intercom HH10BB Intercom Handset with Active Cradle - BlackThe HH10A consists of the hand set 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 hand set, coil cord and cradle, but the coil cord is wired to the cradle which, in this model, contains a hook switch to mute the earspeaker when the hand set is hung up . A ten foot cable is wired to the HH10B cradle, with a 4 pin XLR connector for