I11 TWS Wireless Bluetooth 5.0 Earbud Headset With Charging

Driver: 15mm impedance: 32 ohm bluetooth version: bluetooth v4.2 + edr bluetooth use band: 2.4ghz power level: class ii output power: 30mw bluetooth distance: 10 meters barrier frequency response: 20-20000hz operating voltage range: 3.0v-4.2v mic sensitivity: -42db with a2dp / avrcp high quality stereo audio transmission and remote control protocol powerful noise de-noising circuit (active noise reduction) switch between chinese and english (boot does not connect bluetooth state, press the switch 2 times, hear the tone switch successfully)