Salt multi-use hot water bottle, Dnipropetrovsk region.

Autonomous salt water heater will warm the frozen part of the body at the right moment. After activation, it warms up to 55°С within 5 seconds and keeps warm for about an hour. Very useful for everyone whose work takes place in cold conditions.
The heating pad is returned to its initial state (charging) by boiling for 5 minutes. until the crystals completely dissolve inside the heating pad.