... rechargeable Li-ion battery, support USB charge;- Available in AZERTY, QWERTY, QWERTZ with 49 KeysSpecifications: - Wireless Version: Bluetooth 2.0 + EDR- Frequency ... ) - Weight: 40 gram - Battey: Li-on 200 mAh, charged by USB- Typing time: 60 hours- Standby time: 400 hours- Charging time ... as maximum, good for your health with lowest radiates mini bluetooth keyboard