Note: This is an internal pillow Hand Po fever tablets， not the water. Its working principle and electric blankets as， USB stuck fever， unplug stops heat (no heat). Very low power consumption. Recommends using a mobile phone charger plug to its electricity， or with the use of charge treasure， made a move Hand Po. Pro， after use， remember to unplug the USB plug when the man walked away. Hand Po is removable and washable， remember to acquire a piece of heat down when washable Baby with Water Wash.