Compact design with major thermoelectric cooling power:Koolatron®’s Traveller III is the ultimate personal cooler. Save time and money by bringing your own snacks and drinks to work or on outings or day trips. With a durable hard plastic exterior and convenient shoulder strap, plus efficient thermoelectric cooling or warming, your lunch and snacks will be ready to eat whenever and wherever you are.Portable and safe storage for your perishable items:Enjoy peace of mind when you use the Koolatron® Traveller III cooler to keep perishable items like medication or baby formula cool on the go. Just plug into your vehicle’s 12V receptacle for reliable cooling with no ice or ice packs taking up valuable space. You can even use the optional AC adapter (sold separately) to seamlessly transition from your vehicle to indoors.Tips for Best Use:For quickest cooling, pre-chill items before placing in cooler.For effective operation, ensure fan is not blocked.Minimize opening and closing and ensure lid is closed properly.Lowest possible temperature depends on the surrounding temperature.To avoid draining your vehicle’s battery when using 12V mode, only run cooler when the engine is on.