What is an automatic watch winder?
Watch winder is a device with an electrical motor which will automatically wind your watch when you are not wearing it. Automatic watches have a limited power reserve, so if you stop wearing them and winding them up, they will run down in two or three days. This depends on the watch brand and on movement (caliber) used.
When your watch stops, you must reset time and wind up your watch. If your watch has additional functions (like date, moon-phase display, perpetual calendar), their resetting may take up quite a lot of time and require certain skills. Using an automatic watch winder, you can keep your watch wound and ready to go!
S2302 Automatic watch winder description:
A watch winder for winding 2 automatic watches with storage drawer.
Outer finish: Multi-layer high-gloss piano lacquer;
Interior lining: Faux leather;
Maximum watch diameter: 2.3 inches
Power adapter included.
Additional features:

Soft polyurethane pillows for all watch bracelet sizes;
Watch and jewellery storage drawer;
LCD display;
White LED interior backlight;
2 Independently controlled rotors;
15 available winding programs;
Motor-stop option;
Product dimensions (WxLxH): 7.3 х 9.5 x 10.4 inches
Product weight: 8.4 lbs
Please note: If your watch doesn't wind itself from wrist motion, it cannot be wound by automatic watch winder. Watch winders are not compatible with Seiko Kinetic Watches because the watch mechanism is not the same as traditional automatic movement watches.
Please note: Watch winding mode (winding direction and TPD setting) depends on your watch model. Please, check your watch owner's manual or contact your watch brand's customer service for detailed information.