HardCE Power CF Case for iPAQ series is a product made from China. It generate a built-in TypeII CF Card slot and a built-in 1800 MAH external battery. It’s a product to make power and store extension for IPAQ series. Specification from official website : Built-in 1800mAh Li-ion Battery, CF Card slot type II, Creative Human nature design Case Type, Hardware battery replacement technology, Privileged usage of exterior battery, Low consumption microchip inside, intelligence controls of discharge. over-charge, over-flow, over-puts protection. communicate with main engine and make it display exterior battery quantity, Two-sided dermis inside and out, coffee color and black color optional.