1:use 3pcs AAA size nimh rechargeable batteries,the capacity:1.2V DC 700mA hours 2:working current:120mA at 3.6V DC 3:magnification of lens:3-5 times 4:chargers:input 220VAC output:4.5VDC 200mA charge time: around 8 hours 5:save energy,long life,safety and environment