BOYA Omic-U 2 Transmitter + 1 USB-C Receiver,Button Shape Wireless Lavalier Microphone - White Also available in 48kHz HD audio when noise cancellation is enabled Wide range 20-20,000Hz frequency response - provides exceptional high quality sound Built-in rechargeable lithium-ion battery provides over 5 hours of recording USB-C digital output - universally compatible with computers and Android mobile devices The wireless working range is up to 50 meters The magnetic clip is removable The charging box has wireless charging function Specification: Omic TX Transmitter: Transmission method: 2.4GHz digital band Polar mode: omnidirectional Antenna type: PIFA Operating distance (barrier-free): 50 meters RF output power: 10dBm Distortion: ≤0.1% Frequency response: 20Hz-20kHz Sampling rate: 48kHz Bit depth: 16bit Signal-to-noise ratio: ≥80dB Audio input: built-in microphone Built-in battery capacity: 50mAh Power supply mode: built-in lithium battery power supply/charging box contact charging Battery life: about 5 hours Charging time: about 2 hours Weight: 15.5g Size: 36*36*9.7mm Working temperature: 0 ~ +50℃ Storage temperature: -10 ~ +50℃ Omic receiver: Transmission method: 2.4GHz digital band Polar mode: omnidirectional Antenna type: PIFA Operating distance (barrier-free): 50m RF output power: 10dBm Distortion: ≤0.1% Frequency response: 20Hz-20kHz Sampling rate: 48kHz Bit depth: 16bit Signal-to-noise ratio: ≥80dB Audio output: USB-C digital output Power supply method: power supply from external device Weight: 6g Dimensions: 35.5x18.5x10mm Working temperature: 0 ~ +50℃ Storage temperature: -10 ~ +50℃ Omic CC charging box: Built-in battery nominal voltage/capacity: 3.7V/300mAh Charging time: about 3 hours Charging interface: Type-C interface/wireless charging Number of cycles available for charging: 2 times (2*TX) Weight: 90g Size: 96x46.5x37mm Working temperature: 0 ~ +50℃ Storage temperature: -10 ~ +50℃ Package included: 2 x Lavalier Microphone 1 x Receiver 1 x Charging Case 1 x Charging Cable 2 x Windproof Cover 1 x Storage Bag 1 x English User Manual