OMNITRONIC TM-250 is a VHF bodypack transmitter with a fixed carrier frequency of 211.700 MHz and FM modulation. It provides an RF output power of 8.5 mW and connects to a headset or lavalier microphone through a locking 3.5 mm jack. The condenser microphone has a cardioid polar pattern. The transmitter is powered by one included 9 V 6LR61 alkaline battery and features an LED battery-capacity indicator.