Nexian NXP3100 NexiPak Dual CF & Power Pak for iPaq Pocket PC Increase the memory and extend the battery life of your Compaq iPAQ Pocket PC Two CompactFlash slots for increased memory and connectivity Detachable, rechargeable Li-ion battery usable up to 12 hours Includes LED battery charging indicator and AC jack Compatible with 3700 and 3800 series Compaq iPAQ Pocket PCs