Features: Small size yet has lossless professional sound quality, low noise, low latency, good resolution. 2.4GHz wireless transmission band, 24 bit/48KHz sample rate. One key to switch mono/stereo, meet the needs of your different device. Built-in rechargeable lithium-ion battery that can be conveniently charged by USB. 5 sets of equipment can be supported to work at the same time. Specifications: Material: ABS Sample rate : 24bit / 48KHz lossless digital transmission sound quality Wireless Band: 2.4GHz Delay: Less than 12ms Range: 30 meters outdoor or 15 meters wall distance Lithium Battery Capacity: 550mAh Charging Device: USB charging cable Signal-to-noise Ratio: -98dB Dynamic Range: Greater than 105dB Frequency Response: 20 to 20KHz, +1dB / -3dB Item Size: 54 x 45 x 13mm / 2.13 x 1.77 x 0.51in color: Black Package Contents: 1 x Receiver 1 x Transmitter 2 x Charging Cable 2 x Audio Cable 1 x Manual (English) 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.