Exclusive, high-output TMP technology battery maintenance-free, 18 ampere hour, sealed lead-acid battery, assures ample starting power for extreme conditions. Correct connection protection audible alarm issues warning to safeguard the car battery and jump starter from damage, if the cables are connected to the wrong terminals. Built-in halogen light for emergency illumination. Easy-to-read battery status LEDs displays internal battery charge condition at 100%, 75%, 50% or less. Charging and charged LEDs in the docking station cradle. Heavy-duty, copper-jaw, spark-resistant clamps fit both top and side-post batteries. #4 gauge, 26" cables stay flexible in cold temperatures. Convenient, built-in circuit for automatic charging of internal battery store in docking station to keep battery charged; while away, use the supplied external recharging pack. This versatile, multi-purpose portable power jump starter and DC power source is an absolute must for anyone with heavy-duty needs. The 18 ampere hour, high-output battery provides 500 starting amps of power - perfect for trucks, SUVs, vans and cars. The 50 hours of 12 volt DC power and 110 volt AC rechargeable power, allows this unit a multitude of uses and is perfect for travel or play.