Bluetooth name: KILBURN III Output power: 2*5W Speaker specifications: 52mm 4Ω5W Battery capacity: 1200mah Working voltage: DC 3.7 Charging voltage: DC 5V Bluetooth version: Jerry 5.1 Input sensitivity: 400. Separation: 90db Signal to noise ratio: 80db Bluetooth receiving distance: 15m Playing time: 2-5H Charging time: ≥2H