Wireless Audio Transmission System USB Receiver Rechargeable Transmitter for Violin Electric Bass GuitarFeature:1. Wireless transmitter and receiver kit for electro-acoustic musical instruments, such as guitar, bass, etc.2. Supports 5 sets of equipment working at the same time, one to one; And max. The transmission range is up to 50 meters.3. Ultra-high frequency 730mhz acoustic transmission, anti-interference, ultra-short shorts with time delay.4. Built-in rechargeable lithium battery, long working hours; And it comes with a USB cable for convenient charging.5. Plug and play, simple to use; Compact size and lightweight, easy to carry. Specification:Audio Response Range: 20Hz-20kHzFrequency: UHF 730MHzTransmission Range: Max. 50m/164ft (unobstructed); 30m/98.4ft (Through Wall)Transmission Delay: Less than 4ms Power Supply: Built-in 3.7V 600mAh Rechargeable Lithium Battery Charging Port: Micro USB Charging Time: 2h Continuous Use Time: 6h Net Weight: 130g Size: 110x45x1 5mm/4.33*1.77*0.59'' Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thank you for your understanding.1 x Transmitter1 x Receiver1 x USB Cable1 x Chinese English User Manual