Press RESET button to restart your device.
It is very important to keep your battery charged. If the DP900 runs completely out of power, any new programs you have installed as well as all personal data on it will be lost. When battery power has reached a critically low point, your DP900 shut down and you will no longer be able to operate it without plugging it into a power socket via the Y-cable or cradle. A safety feature designed into the DP900 will maintain data on the device for roughly 72 hours after power has reached this threshold level. When this occurs, you must recharge your DP900 within 72 hours to preserve user data and any programs other than those provided as defaults.