JFOMOYGI Magnetic Key Holder Under Car — Large 7.36×4.25 Splash-Resistant Box with Strong Neodymium Magnets

JFOMOYGI's Upgrade Large Magnetic Key Holder is a heavy-duty, splash-resistant under-vehicle storage box that secures keys, fobs, AirTags and small valuables with four powerful neodymium magnets and a 7.36" x 4.25" internal footprint.

Keep a spare car key or small essentials hidden but accessible with a purpose-built magnetic box that mounts under trucks, cars, trailers and other metal surfaces. The large internal area fits bulky key fobs and multiple items, while splash-resistant latches and removable interior padding protect contents from noise and light moisture. If a magnetic attachment isn’t possible, zip-tie holes give an alternate mounting option.

How much will this hold and what fits comfortably?

The internal size (approximately 7.36" x 4.25") was designed to accommodate oversized fobs, multiple keys and small accessories like AirTags, USB drives or emergency cash. Removable foam padding prevents rattling and can be taken out for extra capacity when needed.

• Fits large car key fobs, house keys, AirTag, USB sticks and folded cash
• Removable padding increases usable space for bulkier items
• Dark finish helps conceal the box beneath vehicles or metal structures

Will it stay attached while driving or in rough conditions?

Four strong neodymium magnets provide high holding force so the box adheres securely to most steel surfaces, resisting separation during highway driving or off-road movement. The self-aligning retainer and four snap latches keep the lid closed until you intentionally open it; for extra protection use a small waterproof bag for electronics or fobs.

• Four neodymium magnets rated to resist up to roughly 50 lbs of separation force
• Four latching clips plus self-aligning retainer for a secure seal
• Recommended: place electronics in a sealed bag before using in heavy water exposure

How can I attach it if there’s no suitable magnetic surface?

JFOMOYGI included two reinforced holes at the top of the case to allow fastening with zip ties, thin chain or cable ties when a magnetic bond isn’t available or you prefer a secondary anchor. The design balances a hidden profile with practical mounting flexibility for different vehicles and locations.

• Two open mounting holes for zip ties or a thin chain
• Low-profile shape to tuck under bumpers, frames, or fixed metal panels
• Can be magnet-mounted for removable access or zip-tied for permanent placement

Is the box weatherproof and durable enough for long-term use?

The case is splash-resistant rather than fully submersible; its solid plastic shell and tight latches keep out light moisture and dirt during everyday driving. For prolonged exposure to deep water or immersion, store electronics and fobs in an extra waterproof pouch inside the box for added protection.

• Durable hard plastic resists daily wear and debris exposure
• Splash-resistant latches and retainer reduce water and dust entry
• Use a sealed bag for complete protection against immersion

Who is this for? The JFOMOYGI Upgrade Large Magnetic Key Holder is ideal for drivers who want a discreet spare-key solution that fits bulky fobs, roadside workers who need an accessible emergency key, and outdoors enthusiasts who require a rugged, hidden storage option under vehicles or metal equipment. It’s suited to anyone wanting a spacious, magnet-mounted hideaway that balances security, capacity and practical weather resistance.