The TG-10T is a 606.5-614MHz (CH 38) Tour Guide Transmitter complete with the earhook microphone CM-801S. The transmiter also has a built-in condenser capsule microphone as standard. Powered by a built in long lasting rechargable lithium battery. Compatible with stationary reciever TG-10SRX and the portable TG-10R. NOTE Optional TG-10CH2 2 way, TG-10CH18 18 way or TG-10CH36 36 way charger required.