The Digi DT8100 Multi Lane Timer provides an Accurate and Simple Timing System - which reduces the likelihood of user timing errors and lost times due to misplaced race results. It simplifies the way you obtain and record your race results; it is also extremely portable and can be used in any location (uses both AC Power & Batteries). The DT8100 Multi Lane Timer is Perfect For: Lap/Split or Bib Races Swimming Running & Sprints Sports Carnivals School Competition Sport Features: 8000 Lap Memory Capacity Inbuilt Printer for Instant Result Feedback Up to 10 Individual Lane Buttons Available for Track and Road Finishes 1 Button Start Removes Inaccuracies from Watching for Gun Smoke 12/ 24Hr User-Selectable Clock 4-Digit Bib Number 4-Digit Place Counter 2-Digit Lap Counter Auto Print Out Print Final Result Function Pre-Entry of Bib Numbers in Track Races Single and Multiple Race Start Times in Road Race Mode Wave Start Option for Road Races for Age Groups or Categories Maximum 99 Waves Race Recall Function Memory Clear Function Printing Pause Function Key Operation Sound AC or Battery Operated (AC Adaptor enclosed) Download Race results to PC via Digi sport instruments software MANUAL