It appears to be well built and made of durable material. It contains a thermostat that heats up to around 100-105*F. I bought it to preheat an oil lubricated air compressor that blew fuses on start up on a cold winter morning. Installation was easy thanks to the 3M self-adhesive backing. Haven't seen it work in a frosty environment yet, so I can only give it four stars, but I'll rate it again in the winter.
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