LOA BLUETOOTH WIRELESS K855KẾT NỐI BLUETOOTH, THẺ NHỚ, USB, JACK 3.5-CÓ MP3-VERSION 4.2-DISTANCE: 10M-FREQUENCY RESPONSE: 100HZ-20KHZ-SIGNAL-TO-NOISE RATIO: 84DB OR HIGHER-SENSITIVITY: 80DB+2DB-DISTORTION: