Point Source Audio CM-i3-5Mm | Dual In Ear Intercom Headset Microphone 5 Pin Male XLR Telex TR700 TR800 TR80N In-ear design eliminates fatigue Speaker Type: Single driver ported Sensitivity: 120dB SPL@1VRMS (at 1 kHz) Directional Characteristics: Cardioid 5-pin male XLR for mono Telex TR700/800 & TR80N