Sennheiser SKP 100 G4-B, Plug-on transmitter, Frequency range: B band (626 - 668 MHz), Turns dynamic wired into wireless microphones, HF output power: Maximum 30 mW, Operating time: Up to 8 hours, Range: Up to 100 meters, Power supply: 2 AA batteries (1.5 V) or battery pack BA 2015 (not included), Dimensions: Approximately 105 x 43 x 43 mm, Weight: Approximately 95 g@+*Note:* Device does not provide phantom power. Operation with condenser microphones is not possible.