1. Lossless professional sound quality, ensuring high-quality audio transmission. 2. Features 2.4GHz wireless transmission frequency band, supporting 24bit/48KHz sampling rate for clear sound quality. 3. Up to 30 meters of effective transmission distance, eliminating cable constraints. 4. Supports one transmitter connecting multiple receivers for simultaneous transmission. 5. Transmitter offers up to 24 hours of battery life, receiver offers up to 6 hours, suitable for extended use. Provides four working modes: left channel, right channel, stereo, and mute, compatible with various devices. Receiver allows volume adjustment and mute control; transmitter includes one-button mute function. 2.4G Wireless Earphone System, Stereo and Mono Support, Rechargeable Transmitter and Receiver Sampling rate: 24bit/48KHz lossless digital transmission Wireless frequency band: 2.4GHz Effective distance: Up to 30 meters in outdoor environments Power requirements: Built-in lithium batteries, charged via USB Type-C Recommended charger: 5V/1A Frequency response: 20Hz20kHz, +1dB/-3dB Battery specifications (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 different displays may cause slight color variations between the image and actual item. Measurement error allowed within +/- 1-3cm.