Automatic pairing upon startup, 2.4G wireless lavalier microphone, no App or Bluetooth required Full-band lossless noise reduction, strong anti-interference ability, and still able to record every detail in a noisy environment 20-20000Hz frequency response range, high-quality restoration of real sound The transmitter has a built-in rechargeable lithium battery, with a battery life of up to 10 hours Wireless operating distance up to 100 meters Specification: Transmitter & Receiver: Transmission method: 2.4GHz digital frequency band Polar mode: omnidirectional Antenna type: ceramic antenna Operating distance: 100 meters (barrier-free) RF output power: 10dBm Distortion: ≤0.1% Frequency response: 20Hz-20kHz Sensitivity: -40dB±2 (1V/Pa) Sampling rate: 48kHz Bit depth: 16bit Signal-to-noise ratio: 85dB Audio input: built-in microphone Audio output: RXD: iOS 8-Pin digital output Power supply: TX transmitter: built-in lithium battery power supply/charging box contact charging/USB-C charging port RXD receiver: get power from external devices/built-in 95mAh lithium battery TX battery capacity: 95mAh TX battery life: about 10 hours TX charging time: about 2 hours Weight: TX: 9.5g; RXD: 6g Size: TX: 53.0*18.4*16.8mm/RXD: 47.4*26.6*11.6mm Working temperature: 0℃ ~ +50℃ Storage temperature: -10℃ ~+ 50℃ Charging box: Battery capacity: 600mAh Charging time: about 2 hours Charging interface: USB-C interface Number of cycles available for charging: 2 times (2*TX) Weight: 74.5g Size: 65.8*52.8*72mm Working temperature: 0℃ ~ +50℃ Storage temperature: -10℃ ~ +50℃