JOYO JW-01 Low Noise Portability Guitar Wireless Audio Transmitter Audio Receiver 1. sound, all digitals, 2.4G audio transfer 2. The transmission distance is 20-30 meters, while 80 meters outside the room 3. Not be influenced by external signals or phones 4. Signal to noise and distortion are more than 87 dB 5. Support one-to-many, one-to-one amplifiers 6. Built-in rechargeable battery and usb interface for recharging 7. Easy to use, plug and play 8. Vniversal for all electric musical instrument 9. Receiver size: 12 x 4 x 2.5cm 10. Transmitter size: 9.5 x 5 x 2.5cm 11. Package included: 1 x receiver 1 x transmitter 1 x adapter 1 x usb hub cable 1 x user manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.