Sampling rate:24bit/48KHz lossless digital transmission sound quality Wireless frequency band:2.4GHz Latency:Less than 12ms Effective distance:less than equal 30 meters outdoor transmission distance or 15 meters through wall distance Power Requirements:Built-in lithium-ion battery rechargeable via USB Lithium battery capacity:transmitter 780mAh, receiver 550mAh Charging equipment:USB charging cable supports fast charging Signal-to-noise ratio:-98dB Dynamic range: 105dB Frequency response:20-20KHz, +1dB/-3dB Colour:Black Material:plastic Package Contents: 1 * Ear Return Receiver 1 * Ear Return Transmitter 1 * Charging Cable 2 * Audio Cable 1 * Chinese and English instruction manual 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.