UTRAI JS-9 Portable Jump Starter and Air Compressor — 4000A 12V Jump Box with 150 PSI Inflator, 18W Fast Charge

Compact but powerful, the UTRAI JS-9 combines a high-capacity jump box and cordless inflator in one rugged unit. It delivers up to 4000A peak current to start 12V vehicles (including hybrids) and supports engines up to 8.5L gas or 6.5L diesel. The integrated 150 PSI compressor, smart LCD display and safety-tested jumper clamps make roadside assistance, camping checks and fleet maintenance simpler and faster.

How quickly can it restart a dead battery and what engines will it handle?

The JS-9 supplies up to 4000A peak current and can perform roughly 40 starts on a full charge, depending on conditions. It’s built to start most 12V vehicles including motorcycles, ATVs, trucks, boats and larger cars, even in very cold or hot weather.

• Peak current: 4000A for quick cranking
• Starting capability: up to 8.5L gasoline and 6.5L diesel engines
• Cycle capacity: approximately 40 starts per full charge (typical)
• Operating temp range: -4°F to 140°F

What does the built-in air compressor do and how accurate is it?

The cordless 150 PSI air compressor inflates car tires, bike tires, sports equipment and inflatable mattresses. A digital LCD shows live pressure readings and lets you preset PSI/BAR/KPA; the pump stops automatically when the target is reached.

• Max pressure: 150 PSI suitable for most vehicle and recreational uses
• Auto-shutoff: preset PSI, BAR or KPA for hands-free inflation
• Speed: ~3 minutes to add 20 PSI to a typical car tire
• Accessories: three gas nozzles and an air hose included

What user feedback and safety features help me use it confidently?

The JS-9 includes a 2-inch intelligent LCD that reports battery level, inflator mode and real-time tire pressure. Smart jumper cables indicate correct connection with a green light and built-in protections guard against reverse polarity, short circuits and overcurrent.

• Display: large LED screen for status and presets
• Safety: reverse-polarity and short-circuit protection
• Indicators: cable connection and battery-level alerts
• Emergency light: flashlight, strobe and SOS modes for visibility

How portable is the unit and what’s included for roadside use?

The JS-9 is designed for trunk storage and field use, supplied in a compact EVA carrying case with all essential accessories. Its 18W fast-charge port keeps phones and devices powered, and the bright LED modes assist nighttime emergencies or camping.

• Included: smart jumper cables, air hose, 3 nozzles, charging cable, user manual, EVA case
• Charging: 18W fast charge for mobile phones and gadgets
• Light modes: flashlight, strobe, SOS for roadside safety
• Support: 2-year warranty and lifetime technical assistance

Who is this for: The UTRAI JS-9 is ideal for drivers, fleet operators, RV and boat owners, outdoor enthusiasts and anyone who wants a combined jump starter and inflator for emergency preparedness. If you need a single compact device that handles large-engine jump starts, accurate tire inflation and device charging while offering clear safety indicators, this unit suits daily commuters and professionals alike.