... : 38%±2% -Power supply: CR2032 lithium battery or button cell -Battery working time: lithium battery , 40 hours;Button Cell, 210 hours;-Sync operation: VR -Working ... Working temp: 0°C~40°C This model SG002, is rechargeable style, if power run out, can used USB charging. ... country, especially ship by airpost.This model SG002, we have rechargeable style, also have batter style, you can chose as ...