Received the product. First, discharge by turning on the flashlight, then charge for over 4 hours before use, as it has virtual electricity. This Can be prolongs product lifespan! Tips for daily maintenance: The battery has a shelf life. Remember to charge the battery once every 2-3 months when you are not using it. If the power supply is low or the storage of virtual power has an impact on the battery, proper maintenance last longer. [1] that the car cannot be started by continuous ignition/or the key cannot be turned, and the positive and negative poles of [2] can not be reversed after every of starting. The two clips cannot be short circuited. [3] Remove the clip within after successfully starting the car. Violation of the above three operations may cause the [fuse box] of the clip to burn out. Please pay attention to the operation method. Night emergency, Rescue lighting: 1. Built-in glare lighting system. 2. Long the middle button for 3 seconds. again in burst mode. 3. After turning on the flashlight, the switch again to become a flash,the switch is the distress mode. Feature: 1000A Starting current. 2000A current. 20000mAh Large Capacity. 3.0L, gasoline 5.0L car can be used. Reverse connection protection. 2 USB charging. Full power can be started 40 times. Limit temperature -20 - 60 Intelligent Protection System. Input: 5V-2.4A Output: 5V-2.4A*2; 12V Colour:Red Material:ABS Package Contents: 1 x Emergency Supply Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.