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Bluetooth Version: Dual-mode Bluetooth V5.0 + EDR, ultra-low power consumption Support protocol: A2DP1.3/HEP1.6/HSP1.2/AVRCP1.6/D11.3 Bluetooth Usage Band: 2.4 GHZ Bluetooth transmission distance: 15-25 meters Battery capacity: headphones: 30 mAh, charging bin: 300 mAh Standby time: 6 hours for TWS earphones Call/playback time: earphone playback time: about 2-3 hours, earphone call time: about 4 hours (support telegram number, iOS system power display) Operation Manual: 1. Turn on the charging box switch (blue or red lights on). 2. Open the top cover of the charging box and take out the headphones. The headphones are automatically turned on and matched. (Important hint: Turning on the charging box switch before turn on the charging box is the prerequisite for the automatic boot-up of headphones). 3. Pairing with other devices: Turn on Bluetooth settings for mobile phones or other devices-Search for Bluetooth name "i11" and click Connect Bluetooth. 4. The headphones are put into the charging box to enter the charging mode, and the headphones are turned off automatically. 5. i11 Tws wireless headset left and right headphones can be separately connected. 6. i11 Tws wireless headphones will automatically shut down if they are not connected to Bluetooth devices for 5 minutes. Headphone Touch Function: 1. Touch the position of the left ear and the right ear and answer the phone with one touch. The volume of the left earphone decreases with two touch. The right earphone increases with two touch. The left earphone clicks the next song with three clicks. The right earphone clicks the last song with three clicks. Long press function of 3 seconds, long press switch of 5 seconds, two headphones call at the same time. 2. Turn on the phone after shutdown, and the headphones automatically connect to the mobile phone. 3. The whole machine has voice prompts. 4. Headphones have sound in both ears for two-channel calls. 5. The playing time of earphone music is about 2-3 hours, the calling time is about 4 hours, and the standby time is about 6 hours. 6. Battery capacity of charging seat is 300mAh and headphone battery capacity is 35mAh. 7. Charging time is 70 minutes. 8. Charging voltage of charging box is 5V. 9. The charging box takes one hour and has a capacity of 300 mAh. The charging red light flashes and is full of charged is constant light. 10. The charging box can charge the earphone about four times. 11. When the headset is charged, the red light is always on and the full light is turned off. 12. The blue light is always on when the charging box charges the earphone. Notes: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Included: 2 X Bluetooth Earbuds 1 X Charging Box 1 X Charging Cable 1 X User Manual