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The Basic Powerpack with TrimFit can be your best choice because it can be used world wide. The Basic Powerpack is also the least expensive option for those who only need heat occasionally.
Therm-ic Basic features...... Can be used world wide! Fits every type of winter boot. Impluse Control- The warmth is transferred from the battery pack to the heating element by impulses. Advantages- Impulse heating elements deliver more energy. Comfortable warmth up to 12 hours with fresh AA alkaline batteries (not included).
You can select between 3 settings to determine the amount of heat you desire. Setting #1: 37C/99F and lasts approximately 12 hours. Setting #2: 45C/113F and lasts approximately 5.5 hours. Setting #3: 70C/158F and lasts approximately 2 hours. Results are based on fresh AA Alkaline batteries. Expect about 20% less results if you use rechargeable batteries. Keep in mind, you don't have the heat on all the time. For instance, you turn the batteries off when you go inside for lunch or if your feet are warm. You'll receive; Instructions on how to use.
2 battery housings that hold 4- AA batteries each and clip to the back of your boot.
Battery specs- weight with 4 batteries- 5.3 ounces, size- 3" high x 2 3/4" wide x 1" deep. 2 heating elements with connecting wires. The heating elements allow you heat with your current insoles. 2 TrimFit self-adhesive Cambrelle fabric covers that prevent your socks from catching the wires or heating elements when you slide your foot in or out of your boot. Therm-ic offers a 1 year manufactures warranty from any manufacture defect.
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