1. Lossless professional sound quality, ensuring audio transmission. 2. Adopting 2.4GHz wireless transmission frequency band, supporting24bit/48KHz sampling rate, the sound quality is clearer. 3. Up to 30 meters of effective transmission distance, easily the constraints of cables. 4. Support one transmitter to connect multiple receivers for transmission at the same time. 5. The transmitter has a battery life of up to 24 hours, and the receiver has a battery life of up to 6 hours, which meets the needs of long-term use. Provides four working modes: left channel,right channel, stereo and mute, to meet the needs of different devices. The receiver can adjust the volume and mute,and the transmitter supports one-button mute function. -12 2.4G Wireless Earphone System Transmission Stereo Mono Recorder Rechargeable Transmitter Receiver Sampling rate: 24bit/48KHz lossless digital transmission sound quality Wireless frequency band: 2.4GHz Effective distance: 30 metres outdoor transmission distance Power requirements: Built-in lithium batteries can be used via USBTypeC For charging, it is recommended to use a 5V1A charger. Frequency response: 20-20K Hz,and1dB/-3dB Battery model specification TX/RX: transmitter 803060, receiver 402030 Battery capacity TX/RX: 1800mAh/200mAh Battery nominal voltage: 3.766% Launcher fuselage size (mm): 95.04(L) X 39.7(W) X 38.12(H)mm Receiver body size (mm): 31.1(L) X 41.5(W)mm Single fuselage weight: transmitter 75g, receiver 15g Color: Black Material: ABS Package Contents: 1 x Wireless Ear Return Transmitter 1 x Wireless Ear Return Receiver 1 x Charging compartment 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.