... Polymer Battery (3.7V DC2800mAh), can continuously works for 11 hours for normal use after charging for 4 hours. u DC 12V ... keysPOWERPower supply:DC 12VBattery supply:Built in Lithium Ion Polymer Battery (3.7V DC2800mAh), can continuously works for 11 hours for ... , auto stand by can save power, it's can display battery dataOTHER DATAWorking temperature:-30°C ~ +70°C Working humidity:30 ...