AKG WMS-40 MINI Vocal/Instrument Set Dual - dual wireless vocal and instrument set US25A/US25C Frequencies: 537.500MHz, 539.300MHz Included: SR40 Mini Dual Receiver PT40 MINI bodypack transmitter Hand-held transmitter HT40 charger AKG SR40 Mini Dual Receiver: Frequency response: 40Hz - 20kHz Harmonic Distortion: 0.8% Signal to Noise Ratio: 110dB Audio outputs: 2 balanced 1/4" jack sockets Dimensions: 133 x 43 x 132mm Weight: 581g AKG PT-40 Mini Bodypack Transmitter: Frequency response: 40Hz - 20kHz Harmonic Distortion: 0.8% Signal to Noise Ratio: 110dB Power: 10mW 3-position switch: on/mute/off Power supply: 1 AA battery Working time: up to 30 hours with a 2200 mAh battery Dimensions: 60 x 75 x 30mm Weight: 60g AKG HT-40 Mini Handheld Microphone: Frequency response: 40Hz - 20kHz Harmonic Distortion: 0.8% Signal to Noise Ratio: 110dB Power: 10mW 3-position switch: on/mute/off Power supply: 1 AA battery Working time: up to 30 hours with a 2200 mAh battery Dimensions: 230 x 52.5mm Weight: 195g