ANC PRO Touch 5.0TWS Master-slave Switch Wireless Bluetooth Headset Intelligent Noise Cancelling(Black) Details: 1. Bluetooth version: Bluetooth V5.1 2. Support Bluetooth protocol: AVRCP V1.6.A2DP V1.3.HFP V1.7 Simultaneous LE and BR EDR 3. Bluetooth operating frequency: 2.402GHz-2.480GHz 4. Receiving sensitivity: -85dBm 5. Bluetooth effective distance: less than 10 meters 6. Speaker power: Rating 3mW 7. Headphone amplifier type: chip built-in 8. Audio signal-to-noise ratio: greater than 90dB 9. Frequency response: 50Hz～20KHz 10. Battery box: Lithium battery 3.7V, 400mAh 11. Music time: about 4 hours (80% volume) 12. Talk time: about 4 oclock (80% volume) 13. Charging time: about 1.5 hours Features: 1. Audio and video synchronization, wireless freedom, dual-channel connection 2. Semi-in-ear design, light and portable, comfortable to wear 3. Binaural HD call, ANC active noise reduction, intelligent noise filtering 4. Built-in capacitive sensing element, sensitive to light touch 5. With a large-capacity charging compartment, it can continuously charge the headset 6. LED digital power display, magnetic charging in the charging compartment, automatic power off when full Note: 1. The product should be in a dry and ventilated room, avoid contact with corrosive substances, and keep away from fire and heat sources 2. The product is charged once every 3 months during storage