1.2.4G wireless transmission: 2.4G wireless communication is adopted between the transmitter and the receiver, with long transmission distance and low delay, and stable transmission of sound data in complex environments. Adopting precision ceramic antenna, combined with scientific layout design, a wireless transmission distance of up to 40 meters can be achieved. Dual-channel radio system. Consists of a receiver and two transmitters, it can capture two sound sources at the same time, perfectly solving dual VLOG and dual live broadcast. Name: 1 to 2 wireless lavalier microphone Transmission protocol: 2.4G Transmission distance: 20m 1 to 2: Support (two transmitters and one receiver) Noise reduction: support Reverberation: support Sound delay: 25ms (18-22ms) Microphone: -422dB omnidirectional Frequency response: 20Hz-20KHz Sampling rate: 44.1KHz (32KHz noise reduction) Signal-to-noise ratio: 70dB Working current: 12mA Power-off current: 20uA Single microphone battery life: 9 hours Dual microphone battery life: Maximum battery life with charging box is more than 33 hours Microphone battery: 110mAh Charging compartment battery: 600mAh Charging box battery life: Can charge two microphones 2.7 times at the same time Charging box input voltage: DC4.5-5.2V (supports fast charging adapter) Adapter: 5V/1A Working temperature: -10-50 Colour:Black Material:plastic type:B:for interface Package Contents: 1 x Wireless Lavalier Microphone set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.