The Wireless Lavalier Microphone (Model K8+) is made of ABS material and features a Bluetooth frequency range of 20-200KHZ. It has a built-in lithium battery with a capacity of 60mAh and a transmission distance of approximately 20m. The microphone has a sensitivity of -42DB and a signal-to-noise ratio of 64dBm. It comes with a receiver, transmitter, instruction manual, and charging cable. The microphone offers stable performance with adaptive frequency hopping and strong anti-interference capabilities. It supports charging while recording and has high-definition, high-sensitivity audio quality. It is compatible with cell phones, computers, and tablets. The built-in rechargeable battery lasts 4 hours.