1. UHF frequency, 8 frequency points, one-click open, not affected by signal interference or noise. The transmitter SET key can change frequencies or pair receivers. 2. Support one transmitter to connect multiple headset receivers, automatically connect after startup, no need to set. 3. Mono high definition sound quality, designed for real-time monitoring of singer performance, delay is less than 3mS. 4. Compact and portable design, can be clamped at . 5. Built-in 500 mah lithium battery, full charge can be used for 4-5 hours. In the ear monitoring wireless system, the sound is transmitted in real time, so it is stable and reliable wherever I go. Ideal singer and musician. Open area wireless receiving distance of 30 meters. Support all audio source devices The headset cable can adjust the volume Colour:Gray Material:ABS Package Contents: 1 * Transmitter 1 * Receiver 1 * wired heeadsat 1 * 6.35 Plug 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.