XVive Wireless System U2, 2.4 GHz Wireless System, Set with transmitter and receiver - both operate with battery and without a power supply, Built-in fixed rechargeable lithium battery, Range without obstacles: Up to app. 30 meters, Frequency range 20 - 20,000 Hz, Latency: 6 ms, 4 Switchable channels, 24-bit/ 48 kHz A/D converter, Dynamic: 105 dB, Operating on a single charge: Up to 5 hours, Including USB charging cable