With 4 cells in each Battery Pack, the Power Plus m4 is Hotronic's most powerful, longest lasting Foot Warmer. Easily installs in all types of footwear and transfers simply from one pair of footwear to another making it that easy. You can use these while skiing, snowboarding, bicycling, Snowmobiling, horseback riding, fishing, and during other general cold-temperature activities.
- Powered by high capacity, cold temperature operation, NiMH cells with 4 push-button controls its easy to adjust temperature-duration settings.
- Easy to read Battery Pack LEDs indicate setting selected and power on / off.
- Battery Packs m3 contain three 3 cells for powerful-yet compact design.
- NiMH cells do NOT have memory effect and do NOT require fully discharging before fully recharging.
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