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ANTENNA 40. INPUT JACK 41. AUDIO MUTE SWITCH 42. LOW BATTERY INDICATOR 43. POWER ON/OFF SWITCH 44. INPUT VOLUME LEVEL 45. IR RECEPTOR SENSOR 46. BATTERY COMPARTMENT 47. LATCHING BATTERY DOOR 48. BELT CLIP/REAR OF UNIT 39 40 41 42 43 44 45 46 47 48 49 49. LAVALIERE MICROPHONE 9 SELECTING THE GROUP/CHANNEL, IR PROGRAMMING, AND SIMULTANEOUS MULTICHANNEL OPERATION (Note: The transmitter should be turned ON and ready for the IR communications with the receiver IR receptor for the following process.)