1. Lossless professional sound quality, ensuring audio mission. 2. Adopting 2.4GHz wireless mission frequency band, supporting24bit/48KHz sampling rate, the sound quality is clearer. 3. Up to 30 meters of effective mission distance, easily the constraints of cables. 4. Support one mitter to connect multiple receivers for mission at the same time. 5. The mitter 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 mitter supports one-button mute function. -12 2.4G Wireless Earphone System mission Stereo Mono Recorder Rechargeable mitter Receiver Sampling rate: 24bit/48KHz lossless digital mission sound quality Wireless frequency band: 2.4GHz Effective distance: 30 metres outdoor mission 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,+1dB/-3dB Battery model specification TX/RX: mitter 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: mitter 75g, receiver 15g Color: Black Material: ABS Package Contents: 1 * Wireless Ear Return mitter 1 * Wireless Ear Return Receiver 1 * 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 +/- 1-3c