... Range:0 to 95% non-condensing humidityVoltage requirement:USB 5V/Alkaline Battery CR2025/3VPower:2Wluminous efficiency80lm/w Product ... 1.Using imported integrated LED chips2.Tri- Folding design,USB supplyvoltage ,easy to usage.3.aluminum alloy socket, ... No Radiation ,no glare, protect nearsightedness .5.Calendar,alarm clock, temperature displaying6.Built in lithium battery, long-time usageYour ...