Reddit reviews BLACK+DECKER TC212B Portable Travel Cooler/Warmer with 12V DC Power Adaptor: 12 Can, 2.3 Gallon Capacity

Holds up to 12 cans/2.3 gallons; Heat contents up to approximately 120 degrees with a flip of the switchCooling function chills contents 40 degrees below ambient temperature; Eliminates the need for ice and creates more storage spacePlug directly into vehicle cigarette lighter or boat power outlet with included 12 volt DC power adapter; Select cold or hot to activate the thermoelectric systemMonitors your vehicle voltage and automatically shuts off when low voltage is detected; Prevents the cooler from draining your vehicle batteryIncludes dual cup holder, shoulder strap, zippered side storage and accessory pouch; Rest cooler on a vehicle seat, tailgate, hatch, or floor for easy access during travel