This model comes with memories. It also shows different color screen. depending on the values, it shows red, green and yellow color screen. *. Sensor: advanced flat surfaced alcohol sensor *. Warm-up time: within 10 seconds *. Respond time: within 5 seconds *. Operating temperature range: 5-40°C *. Detection range: 0.000-0.199% BAC / 0.00-1.99 ‰ BAC / 0.00-0.99 mg/l *. Digital display results (% BAC / ‰ BAC / mg/l) *. Quick response and resume *. Auto power-off *. Use mouthpiece *. Sensor fault self checking *. Blue-colored backlight *. Low voltage indicator *. Power input: 3V (3 x "AAA" alkaline battery, not included) *. Unit size: 122x42x22 mm