Single User Practce Tree Uses Outdoor Brite NHRA Style L.E.D. Lights! Full, Pro, and Blocker Tree - .4/.5 second Tree Speed .000 Perfect Tree Adjustable Delay Box Bump Down Adjustable Rollout Adjustable Auto Start Auto or Manual Reset Statistics - Average/Best Reaction Time Practice Against an Adjustable Preset Time Practice in your Race Vehicle (vehicle connections available) MANY ADDITIONAL FEATURES Runs on 2 "AA" Batteries (Not Included) - Automatic Sleep Mode for Longer Battery Life! -- Warns for Low Battery. Runs off AC or DC Adapter - Same as Eliminator practice tree. Voltmeter -- Measure up to 25 Volts D.C. ,, Optional Probes & Vehicle Connection Available -- Keep Track of Race Vehicle Voltage! Stop Watch / Lap Timer (up to 2000 secs) Select .01 or .1 second intervals Countdown Timer with Alarm -- Set up to 2 Hours Clock & Alarm Clock uses Real Time Clock - Set Time Once PRACTICE in your Race Car!! Nothing else compares to being in your race car when you are seriously practicing! Compatible with most Eliminator Accessories! Some Accessories require a 1/4" to 1/8" Stereo Adapter