BOGEN C20 20 WATT CLASSIC SERIES AMPLIFIER THIS 20 WATT PUBLIC ADDRESS MIXER PROVIDES MIXING OF MICROPHONES, TELEPHONE, AND AUXILIARY SOURCES. OUTPUT JACKS ALLOW A TAPE RECORDER OR AN ADDITIONAL BOOSTER AMPLIFIER TO BE CONNECTED. THIS AMPLIFIER OFFERS HIGH-PERFORMANCE, FLEXIBILITY, AND RELIABILITY FOR MOST APPLICATIONS REQIRING A VARIETY OF INPUTS. FEATURES:  3 INPUTS:1 MIC (LO-Z), 1 TEL, PLUS 1 SELECTABLE MIC OR AUX AUX MUTING W/ EXTERNAL CONTACT CLOSURE OR AUTOMATIC W/ TEL TEL INPUT VOICE-ACTIVATED (VOX) AUX INPUT VARIABLE THRESHOLD FOR VOICE-ACTIVATED AUX MUTE SEPARATE VOLUME CONTROLS FOR EACH INPUT PLUS OVERALL TONE OUTPUTS FOR 4-OHM, 8-OHM, 16-OHM, 25V, AND 70V SPEAKER SYSTEMS SCREW TERMINAL CONNECTIONS FOR MICROPHONES INPUT SENSITIVITY:600 MV, MIC;85 MV, AUX;75 MV, TEL THERMAL PROTECTION AND ELECTRONIC SHUTDOWN EASY-TO-UNDERSTAND AND EASY-TO-OPERATE CONTROLS RACK MOUNTABLE W/ ACCESSORY MOUNTING KIT (2 RACK SPACES) UL AND CSA LISTED