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Specification: brand: xiaomi haylou（eco-chain brand） bt version: bt 5.0 button function: power on/off, music volume/call control, previous/next song operating voltage (v): 3.2-4.7v operating current (ma): 8-10ma microphone support: left/right earbud with one mic charging interface: point contact type speaker type dynamic ring speaker size: 7.2mm lithium battery capacity (mah) 43mah charging time:1.5h charging box capacity: 380mah charging time: 2.5h speaker sensitivity: 110db (1khz) music playtime: 15h impedance (ω): 32 frequency response range: 20～20000hz maximum output power:7dbm transmission rate: 2.1mbps nb : neuf dans carton sceller