Description/Features: Stable Signal Transmission Compatible with Multiple Devices - Plug and Play Light Weight & Effectively prevent whistling audio circuit, rich sound performance, good dynamic tracking ability, fast and stable data processing : Receiver battery: 600mA Frequency range: 630-661MHz Mic type: dynamic coil type Pickup : Heart shaped pickup Frequency response: 50HZ-18KHZ Dynamic range: 96dB Signal to noise ratio: Greater than90dB Power supply : 1.5V x 2 Due to different batches, there may be differences in product appearance and printed text, which will not affect use Material: ABS colour: Black Package Contents: 2 x Anti slip ring 1 x Battery 4 x AA Battery 1 x Charging cable 1 x Receiver 2 x 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.