• 2.4G high-frequency band doesn't cross with other devices: Professional circuit structure, anti-noise and anti-interference ability
• The product has a built-in microphone but also has an external microphone port, the external microphone with a small collar holder can be easily fixed on the chest clothes so that users can use flexible and convenient
• Built-in lithium battery: The transmitter/receiver has a built-in rechargeable battery which is charged via USB cable and lasts about 5 hours

Specifications:

• Battery Capacity: Receiver 550mAh; Transmitter 550mAh (2Pcs total:1100mAh)
• Microphone sensitivity: -38±2dB
• Microphone directivity: Condenser omnidirectional
• Operating voltage: 3.3-5V
• Operating current: max 100mA
• Ambient temperature: -15~65 degrees
• Frequency range: 2.4-2.483GHz
• Receiving and transmitting distance: ≤50m
• Transmitting power: -10~18db
• Receiving sensitivity: -80db
• Frequency response range: 20Hz-20KHz
• Delay time: 12.5ms
• Sampling rate: 48KHz*16bit
• Signal Noise Ratio: 90db
• Distortion: 0.5%@1KHz
• Dynamic range: 90db
• Charging current: 400maH
• Charging time: about 2 hours
• Operating time: about 5 hours
• Product size: 50*50*21mm
• Product weight: 40g for the transmitter/30g for the receiver