The 8900D series comprises of small timers made of lithium battery that are mounted on a panel. The 8925D & 8925DV timers are basically elapsed ones which are equipped with a lithium battery which has a guarantee for 10 years. It can be programmed to record in seconds, min. & sec, hrs. & min. or hrs. & 100ths. If desired the rest button at front can be disabled. A variety of inputs are accepted and thus they are suitable for a wide range of applications.