Specification: Product description: Electric finger rehabilitation trainer（The product does not come with 3 AA 5 batteries） Material: Plastic + electronic components Product size: Host 15*10cm slippers average size 42 Place of Origin: China Product configuration: One host (English) + one pair of slippers (average size, black) + four patches (2 pairs) + power plug (European, American) There are three power supply modes: battery direct power supply (3 AA-5 batteries, this connection does not have batteries); usb cable connected to the computer power supply; Direct AC power supply. Note: This machine does not have charging function, if you use an external power supply, do not use the battery at the same time, to avoid excessive current damage to the equipment! The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom’s policies and EU Product Safety and Compliance laws. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store