A personal thermometer with a twist! Find your equipment in the dark. LumaZip glows for up to 6 hours. Attaches to your tent fly, sleeping bag, coat, pack, keychain, or wherever else you need it. It's lightweight and small enough to take practically anywhere! Reads down to -20º Fahrenheit and includes a wind chill chart. The LumaZip is the perfect addition to your camping, hiking, survival, and travel gear.