The world's most advanced SELECTABLE battery charger for starter/deep cycle batteries, including Odyssey & Optima! OptiMate 7 Select comes with a POWER SUPPLY mode for vehicle memory settings & more! Program Steps - STEP 1: Selection STEP 2: Low Volt Start (0. 5V). STEP 3: TEST before charge. STEP 4: Turbo SAVE. STEP 5: Pulse SAVE. STEP 6: Controlled CHARGE. STEP 7: OPTIMIZE. STEP 8: TEST after CHARGE. STEP 9: OptiMate maintenance. Voltage selection (14. 4V / 14. 7V) ensure the battery receives charge at the correct voltage. Special feature: POWER SUPPLY mode delivers stable power for vehicle system reprogramming, show room vehicle demo or retaining memorised settings when battery cables are disconnected to fit powered accessories or replace the battery. SAFE: No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected. 3-year limited replacement .