1. Lossless professional sound quality ensures high-quality audio transmission. 2. Features a 2.4GHz wireless transmission frequency band with support for 24-bit/48kHz sampling rate, delivering clear sound quality. 3. Up to 30 meters of effective transmission range, eliminating the limitations of cables. 4. Supports one transmitter connecting multiple receivers for simultaneous transmission. 5. Transmitter offers up to 24 hours of battery life, while the receiver provides up to 6 hours, suitable for extended use. Offers four working modes: left channel, right channel, stereo, and mute, compatible with various devices. The receiver allows volume adjustment and mute control; the transmitter includes a one-button mute function. 2.4G Wireless Earphone System, Transmission, Stereo, Mono, Recorder, Rechargeable Transmitter and Receiver Sampling rate: 24-bit/48kHz lossless digital transmission Wireless frequency band: 2.4GHz Effective distance: Up to 30 meters outdoor Power requirements: Built-in lithium batteries, rechargeable via USB Type-C Recommended charger: 5V/1A Frequency response: 20–20,000 Hz, +1dB/-3dB Battery model TX/RX: Transmitter 803060, Receiver 402030 Battery capacity TX/RX: 1800mAh / 200mAh Battery nominal voltage: 3.7V Transmitter dimensions (mm): 95.04(L) x 39.7(W) x 38.12(H) Receiver dimensions (mm): 31.1(L) x 41.5(W) 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 Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.