1. 2.4G digital wireless, universal frequency band worldwide; 2. Visual power, audio dynamic monitoring and other screen display functions 3. Built-in and external MIC two input methods; 4. Mono / stereo, multiple output options 5. Support real-time monitoring; 6. High fidelity sound quality 7. Automatic frequency hopping, stable transmission; 8. Low audio delay less than 20ms 9. Stable transmission distance up to 50m; 10. Multifunctional back clip design, compact and powerful specification: Product Name: Audio Receiver Wireless frequency band: 2400-2483.5MHz Transmitting power: + 10dBm Receiving sensitivity: -86dBm Antenna: PCB antenna Audio output amplitude: + 0dB ~ + 12dB < p> Audio output interface: 3.5mm TRS Receiving interface: 3.5mm TRS / TRRS Battery: Lithium polymer 300mAh 3.7V Battery life: 5 hours color: picture color Material: ABS size: 39x22x55mm Package Contents: 1 * receiver Only the above package content, other products are not included. Note: Light shooting 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.