K13 2 in 1 Lavalier Wireless Microphone with USB-C Type-C Receiver & Charging Station 1. Facilitates remote high-definition audio capture for online streaming, video VLOG shooting, interview recording, video tutorials, etc. 2. It has automatic noise reduction, reverberation, monitoring, external playback, mute functions, and supports charging mobile phones. 3. Adopts 2.4G wireless pairing, automatically connects when turned on, is easy to operate, and supports two people using it at the same time. 4. Equipped with Type-C interface, compatible with most laptops, desktop computers, smartphones and other common Android interface devices (Android phones need to support OTG function, OPPOvivoIQOORealme and other mobile phones need to turn on OTG power in the settings) Normal use) . 5. Built-in charging box, convenient for storage and easy to carry. Specifications: 1. Input voltage: 5V 2. Battery capacity: 70mAh 3. Charging compartment battery: 300mAh 4. Battery life: 6 hours 5. Signal-to-noise ratio: 64dBm adaptive noise reduction 6. Transmission delay: 30ms 7. Sensitivity: -42 dB 8. Frequency response range: 20-20kHz 9. Transmission distance: 15-30m (barrier-free)