Specification: Item Type: Wireless Lavalier Microphone _x000D_Material: ABS_x000D_Model: K9_x000D_Frequency Range: Bluetooth_x000D_Frequency Response Range: 20-200KHz_x000D_Microphone Built in Lithium Battery Capacity: 2 x 60mAh (built in)_x000D_Transmission Distance: 20m / 66ft_x000D_Transmission Delay: 30MS_x000D_Sensitivity: -42dB_x000D_Microphone: Silicon Mic_x000D_SNR: 64dBm_x000D_Use Time: About 4 Hours Features: 1[Anti Interference and Stable] Wireless lavalier microphone adaptive frequency hopping, strong anti interference, stable signal, long distance. 2[Function] Wireless lavalier mic auto pair, plug and play, supports slow charging or fast charging of phone (while recording and charging). 3[High Sensitivity] Built in 360 degree omnidirectional HD high sensitivity microphone, also supports for ECM, for MEMS, for analog mic. 4[Good Compatibility] Lavalier lapel microphone has good compatibility and supports mobile phones, computers, and tablets at the same time. 5[Rechargeable Battery] Type C wireless lavalier mic sounder built in 60mAh rechargeable button battery for 6 to10 hours of battery life. PackageList: 2 x Receiver 1 x Transmitter 1 x Manual 1 x Charging Cable