The Schumacher 400 Peak Amp 12-Volt Automotive Lithium Jump Starter and Portable Power Pack (SL1338) is a multi-purpose power source designed to solve a range of problems, making it a valuable investment. With the SL1338 you can avoid getting stuck with a dead car battery or no charge on your mobile phone. As a jump starter, the SL1338 features 400 peak amps, which is strong enough to jump start 4-cylinder engines. The lithium-ion battery powering the SL1338 can be used for up to 15 jump starts before it needs recharging. The SL1338's safe smart clamps and booster cable provide peace of mind, protecting against reverse polarity, short circuit, low voltage, high temperature, and reverse charging, preventing damage to both your vehicle's battery and the jump starter. The unit is also a powerful portable power pack. You can quickly charge your USB devices—such as smartphones, wearables, and tablets—by plugging them into the device’s 2.4A USB port. Other features include a four-LED battery level indicator, a power On/Off button, and a built-in, three-mode LED light.