Built-in li-ion battery, you don't need to frequently change battery. the user manual would tell you the detailed bluetooth pairing process. bluetooth: - executive standard: bluetooth v3.0 - operating distance: 10 meters modulation system: fhss 2.4g transmitting power: class 2 battery: - built-in li-ion battery - battery capacity: 430mah - battery life: 3 years - battery dimensions: 47mm x 24mm x 4.5mm operating voltage: 3.0v ~ 5.0v current: - working: - sleeping: - charging: >=100ma standby: - current: 2.5ma - time: 100 days charging time: 4 ~ 4.5 hours uninterrupted working time: 90 hours key life: 5 million strokes operation temperature: -10 celsius degrees ~ 55 celsius degrees storage temperature: -40 celsius degrees ~ 70 celsius degrees dimensions(l x w x h): 205mm x 140mm x 25mm what's in the box: 1 x bluetooth keyboard case 1 x usb power charging cable 1 x user manual epathdirect after service: 30 days money back guarantee, 12 months warranty!
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