Pro Intercom HH10BB Intercom Handset with Active Cradle Black The HH10B consists of the same handset, coil cord and cradle of the HH10A model, 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 connection to an intercom station. We recommend the HH10B for quiet environments where the audio from the earspeaker (while the hand set is in the cradle) would be a nuisance. Key Features Equipped with dynamic transducers suitable for intercom use Interior is partially filled with dense mastic material blocking internal acoustic coupling between the microphone and earspeaker High quality shielded coil cord fitted with a genuine Neutrik connector Handset is molded from commercial telephone quality compounds Technical Specifications Earspeaker Impedance: 150 Ohm @1kHz Freq. Response 200-3200Hz Sensitivity nominal 116dB @ 1kHz Microphone (Dynamic) Impedance 150 Ohm @1kHz Freq. Response 300¡4.5kHz Sensitivity nominal 51dB @ 1kHz Weight Excluding connector & cradle - Approx 12.5 oz