Stable voltage, current, balance charge function. Class A cell, safe and explosion protective. Upgrade 4 cell and start strongly. 3000A Peak current. Diesel 5.0L, gasoline 6.0L car can be used. Reverse connection protection. 2 USB charging. Full power can be started 30 times. Support 18W phone fast charge. Limit temperature -20 60C. Intelligent Protection System. Night emergency, Rescue lighting: 1. Built-in lighting system. 2. Double click to enter,flashes,double click again to exit. 3. Long press the switch button for 3 seconds. Press again in burst mode. 4. After turning on the flashlight,press the switch again to become a flash,the switch is the distress mode. Notice: 1. Please charge after receive jump starter. 2. Charge every 3 months, low power may fail start. 3. Charge phone tablet only occasionally. efficiency is about 50%.