Feature: 1. The wireless transmitter and receiver can be used for electro-acoustic instruments such as guita 2. Ultra-high frequency 730MHz original sound transmission， anti-interference， ultra-short time delay. 3. Support 4 groups of devices to be used at the same time， the maximum transmission range can reach 30 meters. 4. Built-in rechargeable lithium battery， long working time， equipped with USB cable， convenient charging. 5. Plug and play， easy to use， small in size， light in weight and easy to carry. Specification: Product name: Wireless audio system Model: A8 Interface: Micro USB Frequency range: UHF Frequency broadband: 20Hz-20KHz Transmission delay: >4ms Product size: 110x43x17mm/4.33x1.69x0.67in Note: Due to the different monitor and light effect， the actual color of the item might be slightly different from the color showed on the pictures. Thank you Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 X Transmitter 1 X Receiver 1 X USB Cable 1 X Manual