The T20 Series Surveillance Listen Only Earpiece receive-only earpiece allows the radio user to privately receive messages. It is ideal when the mission requires discreet one way, clear communication. The T20 offers a 14” cable and a 3.5mm connector. Transducer AcousticsSensitivity 108dB+-3dB @ 1KHzNominal Input Power 60mWMaximum Input Power 100mWFrequency Response 100 - 10kHzDistortion (THD) <15% (RX) CableDurability DuPont Kevlar Fiber ReinforcedDiameter 2.3mm Environmental SpecificationsOperating Temp -20°C to +70°CStorage Temp -30°C to +85°C