Koso's Mini4 tachometer uses an LCD screen powered by an inner CR 2032 changeable battery that allows installation on any vehicle. With the small, compact and userâ??friendly size, it is perfect for many applications. It also features a backlight, has a RPM display warning and also keeps track of your maximum RPM. Specifications: RPM: R (Range): 0 ~ 20,000 RPM, U (Unit):10 RPM. RPM input pulse: R (Range): 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6. Max RPM record: R (Range): 0 ~ 20,000 RPM. RPM display warning: R (Range): 5,000 ~ 20,000 RPM | U (Unit):100 RPM. Effective temperature range: 14 ~ 140°F (-10 ~ 60°C). Backlight: 12V DC. Meter supply voltage: DC 12 (battery). Power LCD: CR 2032. Battery lifetime: ± 350 H. Meter standard: JIS D 0203. Meter size: W 61.5 x L 33.7 x H 15.6 mm. Meter weight: ±30 grams.