Batteries 3.7Vdc 500mAh RX/TX 3000mAh power case

Buy at www.musicianscart.com NUX B-6 Wireless Saxophone Microphone System 2.4GHz,License-free dynamic 2.4GHz operation,High-definition low-latency digital audio,Supplied in rechargeable power case,Voicing scenes for Alto (green) Soprano (red) and Tenor (yellow) saxophone,Auto-pairing and battery-saving mode,Power supply Rechargeable via 5V USB or power case,Batteries 3.7Vdc 500mAh RX/TX 3000mAh power case,Battery life Up to 7 hours of playing time,Carrier frequency 2.4GHz license-free band,Wireless range Up to 20m line-of-sight,Audio format Digitally encoded 24-bit 44.1kHz,Latency <4ms,Frequency response 20Hz – 20kHz,THD +N Less than 0.2% 1kHz @-10dbFS,Capsule Custom voiced electret condenser,Dimensions 153 x 113 x 55mm (in power case),Weight 389g (in power case)