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Basic product parameters: Bluetooth version: Bluetooth v5.0 Effective distance: 32.808 feet /10m (Free of obstacles) Headphone charging time: 1hrs Charging box charging time: 2.5-3hrs Charging box charging input: DC 5.0V=700mA Charging box charging output: DC 5.0V=500mA Our advantage: Usage mode: binaural mode; left/right single monaural mode Monaural or binaural: binaural stereo (can be used alone) Function: Support music / voice prompts / call / listen to e-books Color classification: black, white, red, skin color Product weight: 5g (unilateral earphones) / 45g (charging box) Charging box size: about 80.2*40.2*31mm/2.406*1.206*0.93in Earphone size: about 23.8*21*23.5mm/0.714*0.63*0.705in Charging box battery capacity: 800mAh Earphone battery capacity: 60mAh Music duration: about 4 hours Call duration: about 5 hours Monaural standby time: about 54 hours Bimaural standby time: about 43 hours Packing list: Earphone *2 Charging box*1 Instruction manual *1