Absolute bargain for £20, ordered one myself.
Used other less powerful one before and started up a 2litre diesel with no problems.
CAR BATTERY BOOSTER: this 15,000 mAh battery with 500A peak current can quickly restart your vehicle about 18 times with full charge. Only used for 12V battery output vehicles (5L gas or 3.5L diesel engine), such as car, motorcycle, SUV or small steamboat
Smart Safety Clamp: the built-in controller box on the clamps will work only when the connection to the car battery is correct. Don't worry if you connect the wrong polarities, the clamps would protect itself and the jump starter from short circuit or reverse charge. Good fire resistant and isolating material
EXTERNAL CHARGER: The 12/16/19V DC output and the dual USB ports are compatible with almost all Apple and Android smartphones, tablets, laptops and other electronic devices. The built-in IC for both USB port can automatically adjust the output current for different devices, which means your device can always be charged efficiently without getting damaged
3 MODES OF EMERGENCY FLASHLIGHT: steady strong light / SOS light / strobe light
SPACE-SAVING DESIGN: the unit's small size allows it to fit into the portable and sturdy carrying bag with all of the accessories, allowing utmost mobility