1. Delayed 2 Bluetooth protocol: A2DP1.2, AVRCP1.0, HFP1.5, HSP1.0. Transmission distance: 10 m 4. The sound frequency range: 80Hz-20KHz. Speaker output power: 100 MW 6. Horn sound pressure level: 113dB/ - 3dB (1kH/1Vrms) 7. The signal to noise ratio: the distortion of equal to or greater than 80dB.: less than or equal to 1.0%. The microphone sensitivity: -42dB. Playing time: 10 hours 11. Charging time: 2.5 hours 12. Battery capacity: 190ma