K7 2 in 1 Lavalier Wireless Microphone with Charging Dock 1. 2.4G wireless technology with automatic frequency matching. 2. DSP intelligent noise reduction technology filters out background noise, resulting in clearer vocals. 3. High-quality condenser microphone with omnidirectional ultra-clear sound pickup. 4. Supports real-time monitoring with zero latency. 5. Continuous recording for 10 hours per session 6. The base dock has a built-in 18650 battery, ensuring extended battery life. 7. Lavalier design makes it easy to carry and perfect for online meetings, live streaming, blog recording, karaoke, ect. Specifications Input Voltage: DC5V Microphone Battery: 80mAh Charging Case Battery: 800mAh Battery Life: 5 hours SNR: 64dBM (ANC) Transmission Latency: 30MS Sensitivity: -42dB Frequency Response: 20-20kHz Transmission Distance: 20 meters (unobstructed) Charging Dock Dimensions: 83x49x41mm Receiver RX Dimensions: 48x27x9mm Microphone TX Dimensions: 66x18.7x22mm