The microphone frequency is variable frequency, with multiple sets of adjustable frequency points. Multiple sets can be used at the same time without -frequency. Compatible with devices: microphone/MIC/microphone device, plug and play. Standard 6.35 plug, equipped with 3.5mm adapter, good versatility, suitable for more audio equipment No need for cumbersome settings, it can automatically connect when you turn it on, one-click frequency binding, plug and play Long-distance reception: frequency band/good anti-interference performance, stable long-distance transmission signal, loud sound/clear sound quality Suitable for saxophone/euphonium/trumpet/trombone euphonium/french horn and other instruments Colour:black Material:plastic Package Contents: 1 x Receiver 1 x Lavalier Microphone 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.