[2.4GHz Wireless IEM System]M7-S wireless in-ear monitor system adopts 2.4G wireless transmission, with lossless sound quality, low noise/lowlatency. One-Key to change mono/stereo input, providing smooth frequency response with any earphones. [Long Battery Life]Built in Rechargeable Lithium Battery, it can last up to 12 hours per use after a full charge, make suring your show is complete and perfect! Less than 12ms Latency. [One to More]One wireless transmitter can be paired with multiple receivers to send signals. The wireless transmittion distance is 90 feet, perfect for small/medium stage performance and daily band practice.2.4G wireless technology,low delay, no compression; [Support stereo and mono] Connectivity technology: Wireless, Wired, Headphone jack: 3.5 mm Jack, Transmitter: 3.5mm Jack [ Collar Clip Design]The clip design makes it easy to clip on your pack pocket or clothes. It's small and cute and not easy to fall off, allowing you to fully immerse yourself in the world of music without any worries. Colour:Black Material:aluminum alloy Package Contents: 1 * Receiver 1 * Transmitter 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.