The Lithium Ion Jump Starter Power Pack (SL1639) is a compact and portable automotive tool that offers 800A peak and 400A cranking power, making it suitable for jumpstarting vehicles with ease. With a capacity of 8000mAh and a voltage of 12V, this power pack is designed to be a reliable solution for automotive emergencies. The included USB allows for 5V of power for charging other devices while on the go. This product is perfect for anyone needing a convenient and powerful jump starter for their vehicle.