It is housed in a plastic body and has a in built 12V 7 Ah (Ampere hour) sealed maintenance free (SMF) lead acid battery, which is charged by Solar module. The lantern is fitted with a four pin 7 watt compact fluorescent lamp. The CFL provides light output (52 lumens per watt) equivalent to that of a 40 watt (9 lumens per watt ) bulb. The solar lantern has a built in detachable electronic circuit having inverter & charge controller. High efficient two step charge controller protects battery from deep discharge & over charging.