GWU4 GTRS wireless guitar system, 4 channels, rechargeable transmitter and receiver operating on the UHF frequency band (660-663 MHz), effective range: 30 m, frequency response: 20Hz to 20kHz, latency less than 0.3 ms, dynamic range greater than 103 dB, about 6 hours of autonomy, USB cable included, dimensions: 190 x 30 x 20 mm, weight: 90 g.