Joinwin&reg; Assorted Color Handheld Tally Counter 4 Digit Display for Lap/Sport/Coach/School/Event (Black) 1. No batteries required; counts up to 9,999 2.ABS Plastic Casing, serveral colors available 3.Instant reset knob and comfortable finger grip 4.Lap and rep counter, ideal for a variety of athletic training activities 5.Very useful item for a restaurant bars and occasions where numbers of visitors are restricted