This is the LEFEET Rail Kit for Mounting on Watercraft/SUP for S1/S1 Pro Features: Size: 24.1cm*11.3cm*7.5cm Weight: 275g Compatible with most paddle boards on the market. Add-on power to your paddling. Multi-Purpose Mount KitBase) Multi-Purpose Mount Kit Plug User manual Check out the rest of the LEFEET Scooter Collection