Wireless audio transmission system powered by built-in rechargeable lithium batteries, are suitable for guitar, bass and other instruments with 6.35mm audio output jack. Transmitter and receiver with 6.35mm mono audio plug, 60 rotatable, compatible for different audio jack position. Transmitter and receiver are matched automatically when power on, one button for all control, easy and convenient to use. UHF frequency and FM high fidelity coding technology, delay time less than 5ms, without compression or distortion, and max. 20M transmission range. System Frequency Response: 40Hz-18kHz Channel: 5 UHF Channels Transmission Range: Max.20M (No obstacle) Transmission Delay: Less Than 5ms Signal Noise Ratio: Less than -85dB Power Supply: Built-in 3.7V 380mAh rechargeable lithium battery Charge Port: Micro-USB Item Size: 12 x 2.5 x 2cm / 4.7 x 1 x 0.8inch Item Weight: 47g / 1.7oz (for each) Colour:As Shown Material:plastic Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Receiver 1 * Transmitter 1 * Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.