Remote Speaker Microphone – Submersible Public Safety Grade fully waterproof/Submersible Mil Spec 810F certified speaker microphone with volume control and 3.5mm accessory jack. Compatible with Motorola XTS 1500/2500,3000/5000, Motorola HT1000/MTS2000, Ef Johnson 5100 Series Radios. AVAILABLE FEATURES – Emergency Button – High/Low Volume – Antenna Jack – 2.5mm, 3.5mm or 3.5mm threaded audio jack CABLING – Jacket: 5.5 Polyurethane, Kevlar Reinforced MECHANICAL – Axial Pull at Speaker Mic Head: 50lbs ENVIRONMENTAL – RoHS Compliant – Kevlar Reinforced Professional Grade – MILSPEC 810F SPEAKER – Transducer: Moving coil dynamic speaker – Impedance: 8;15% @1KHz – Sensitivity: 120 dB;10%@1KHz – Resonance: freq (F0) 400HZ;20% – Frequency: response F0~9KHz – Rated input power: 0.5W – Maximum input power: 1W MICROPHONE – Type: Noise Cancelling (available without) – Transducer: Electret condenser microphone – Sensitivity: -34;2dB@1KHz 2.2K 3V 0dB=1v/pa – Impedance: Max:2.2k @1KHz – Directivity: Omni-directional – Frequency: 100Hz;16000Hz – Max operation voltage: 10V – Standard operation voltage: 3V – Current consumption Max: 0.5mA – S/N ratio Min: -34dB @1KHz CERTIFIED MIL-STD-810F