Wireless Type: IROperating Time: Up to 12 hrs (receiver)Distance: Up to 40 ft. (12 m)Frequency Response: 50Hz-16KHzTHD: <1% (1kHz)Signal to Noise Ratio(SNR): typ. 75 dB(A)Sensitivity: 125 dB (1kHz)Weight: Weight (receiver): approx 1.8 oz. (50 g) (incl. accu) Weight (transmitter): approx 9.2 oz.