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Specifications: Model: Haylou-GT2S Bluetooth version: v5.0 Operation range: 10m (open space with no obstacle) Charging time (earbuds): approx. 1.5hr Charging time (charging case): approx. 3hr Standby time: approx. 100hr Playing time: approx. 4hr Battery life (with charging case): approx. 12hr Battery type: li-ion Battery capacity (single earbud): 43mAh Battery capacity (case): 310mAh Bluetooth profiles: HFP/HSP/A2DP/AVRCP Functions: playback/pause, music control, incoming call notice, stereo talking, noise isolation, voice prompt