Digital clock which can be set to 12 or 24 hour format. Accuracy is +/- 1 minute a year. Gauge has a lithium replaceable battery for back-up so it will not lose time is power is lost. Mounts in any std 2-1/16" gauge hole. Lifetime warranty to the original purchaser, excluding abuse and back-up battery. Made in the USA by TELTEK. Please call for a complete listing of all TELTEK digital gauges.