The Hotronic S4+ Custom Set now has a stronger, more durable and faster charging battery set than ever before. Two NiMH Battery Packs can provide up to 21 hours of heat on the lowest setting (outside temperature depending) and can be very dependable in the cold weather. The NiMH Battery Cells do not have a memory effect, and does not need to be fully drained before being recharged. The S4+ Custom Set is very easy to install on any type of footbed, either custom, pre-molded and stock footbeds. Four Heat Settings allow you to keep your feet as warm as possible, on even the coldest days on the mountain. Warmer feet, improve your balance, better balance improves your skiing, start skiing better with the new Hotronic S4+ Custom Set today. Improve your Skiing and Balance, A Must have for Diabetics, Easy to Install on Custom, Premolded and Stock Footbeds, 4 Heat Settings, NiMH Batteries, Up to 21 Hours of Battery Life, The Highest Setting is a Timed Setting to Prevent Burns, Includes 2 Batter Packs, Charger, Heating Elements, Cambrelle Covers and European Outlet, Model Year: 2022, Product ID: 607657, Model Number: 01-0100-1043, GTIN: 9120070765577