Professional personal wireless in-ear monitor system The NUX B-7 PRO is a personal wireless in-ear monitor system with automatic setup, 2.4 GHz interference-free broadcasting frequency, and 24-bit 48 kHz high-quality stereo audio. The operation range is up to 50 meters (160-feet) with very low latency wireless transmitting. Specifications - Operating Frequency Band: 2400-2483.5MHz - Transmit Mode: Frequency Hopping - RF Output Power: 10mW E.l.R.P. max - Audio Quality: 24bit/48kHz - Frequency Response: 20Hz-20kHz - Latency: 7.33ms(low latency setting)-10.85ms(default)-14.33ms(safe setting) - Unbalanced Input lmpedance: 10kΩ - Balanced Input lmpedance: 20kΩ - AUX Input Level: 2.1 Vrms(8.7dBu) max - Balanced Input Level: 9.8 Vrms(22dBu)max - Headphone output Impedance: Minimum 13Ω - Headphone Maximum output power per channel: 57mW (THD<0.1% RLOAD=16Ω,1kHz) - Channel separation: -105dB - THD+N: <0.01% typical - Dynamic Range: 110dB A-weighted - Output level Adjustment Range: Mute -86dB~+12dB - Auto-0ff: It automatically turns off after 10 minutes of no connection or if the connection is lost - Built-in Battery Capacity: Rechargeable Li-polymer (Transmitter 3.7V/3000mAh, receiver 3.7V/400mAh) - Battery Lifetime: TX: Up to 6 hours/ RX: Up to 6 hours - Power Requirements: DC 9V, 1A min, negative tip power supplies(Transmitter) - Operation Range: Up to 50m (165 feet) maximum - TX Dimesions: 140mm*97mm*53mm (L*W*H) - TX Weight: 525g - RX Dimensions: 47mm*71mm*22mm (L*W*H) - RX Weight: 51g