Approx 5C on Cool 30C on Heat. Plug and Play， adopting USB Powered. No Driver Needed. Will work with any PC or Macintosh. Cool or Heat Objects Inside Temperature: Approx 5C on Cool 30C on Heat Power Source: USB Powered Dimension: -Total Size 200x83x94mm (LxWxD) -Space Inside 140x80x70mm (LxWxD) Plug and Play No Driver Needed. Will work with any PC or Macintosh Off， Cool， Warm Switch After Sales Service: 1 Year Warranty Package Include: 1 x Heater 1 x User Manual