What should I pay attention to when installing the seed phrase into the backup box?

Please install your recovery phrase away from others and cameras. Do not take photos. Do not read aloud. After installed, Store in a secure place, with a lock, to prevent others from viewing it.

Why I record only the first 4 letters of each mnemonic word? Is this safe?

Yes — it’s safe. The BIP39 standard uses a list of 2048 words where no two words share the same first four characters, so the first 4 letters unambiguously identify each word. Wallets can complete the full word from those four letters.

Why not just write my seed phrase on paper?

Paper can burn, tear, or be damaged by water. A metal backup provides stronger long-term protection.

How many mnemonic phrases can one HeirBOX S1 back up?

The imKey S1 features a double-sided design and can store two sets of recovery phrases (Side A and Side B can each hold one 12-word recovery phrase). Each slot can store 4 letter tiles, which is sufficient to cover all BIP39 standard word lengths.

How should I install recovery phrase words that contain only three letters?

Use a blank tile (included) for the fourth position. Three-letter words are already unique in the BIP39 list, so the blank simply completes the slot.

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imKey HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet

Product ID: 516266981

Details

Brand
imKey
Color
Silver
Included Components
1 x HeirBOX S1
Item Weight
6.4 ounces
Lock Type
Key
Material
Stainless

💧Waterproof & corrosion-resistant

🔐Dual-sided secure seed phrase storage

🔥1398°C melting point steel

$69.48

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ The ultimate cold storage fortress for your crypto legacy

UNMATCHED FIREPROOF SECURITY - 304 stainless steel withstands up to 1398°C, protecting your crypto from any disaster.
UNIVERSAL BIP 39 COMPATIBILITY - Supports 12/18/24-word phrases and works seamlessly with Ledger, Trezor, MetaMask, and more.
FOOLPROOF MISTAKE PROOF DESIGN - Physical dividers and locking tiles eliminate errors and loss during backup and recovery.
WATERPROOF CORROSION RESISTANT - Keep your seed phrase safe from water damage and rust for decades to come.
DUAL SIDED STORAGE FOR DOUBLE PROTECTION - Store two separate 12-word seed phrases on one compact plate—perfect for multi-wallet pros.

The imKey HeirBOX S1 is a premium stainless steel seed phrase backup plate engineered for maximum security. Fireproof up to 1398°C and fully waterproof, it safeguards your 12/18/24-word BIP39 mnemonic phrases offline. Featuring dual-sided storage, laser-engraved characters, and a mistake-proof locking system, it’s compatible with all major cold wallets like Ledger and Trezor. This durable, corrosion-resistant kit ensures your crypto keys survive any disaster, giving you peace of mind and true ownership of your digital assets.

Specifications

ASIN	B0BTM24566
Additional Features	Fireproof, Waterproof
Best Sellers Rank	#323,700 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #412 in Safe Accessories
Brand Name	imKey
Chamber Depth	0.24 inches
Color	Silver
Control Type	Key Control
Customer Reviews	4.6 4.6 out of 5 stars (111)
Included Components	1 x HeirBOX S1, 3 x metal letters plates, 1 x screwdriver, 6 x screws, 1 x instruction
Item Dimensions D x W x H	4.13"D x 0.24"W x 2.36"H
Item Weight	6.4 ounces
Lock Type	Key
Manufacturer	IMKEY Co., Ltd
Manufacturer Part Number	HeirBOX S1
Material Type	Stainless Steel
Model Number	HeirBOX S1
Mounting Type	Screw-mounted
Number of Items	1
Unit Count	5.92 Ounce
Water Resistance Level	Waterproof

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$69.48

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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