Master Lock 5400EC Black
Score: 78/100
Master Lock 5440EC
Score: 85/100Rankings
The Master Lock 5440EC is a portable, smart key lock box designed for realtors and property managers who need flexible, temporary access control. Its key strength lies in its Bluetooth connectivity and app integration, allowing for tamper and low-battery alerts. While it lacks the permanent stability of wall-mount options, it is ideal for short-term rentals and property showings.
The Master Lock 5400EC is a versatile, portable key safe that offers reliable mechanical security for up to five standard keys. Its primary trade-off is the vulnerability of its shackle to cutting tools and limited capacity for bulky items. It is best suited for realtors and homeowners needing temporary, flexible access solutions.
| Attribute | | |
|---|---|---|
5 keysbest | 5 keysbest | |
15.8 cmbest | 12.2 cm | |
8.3 cmbest | 8.3 cmbest | |
3.8 cmbest | 2.9 cm | |
| ↓ lower better | 0.45 kgbest | 0.5 kg |
36 mm | 46 mmbest | |
— | 1 yearsbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Durability & Environment(1) | ||
Weather Resistance Rating | weather_resistant | Weather resistant to -40° |
Installation & Mounting(1) | ||
Mounting Type | over_the_knob_wall_mount | Portable over-the-knob |
Design & Fit(2) | ||
External Height (cm) | 15.8 cm | 12.2 cm |
External Depth (cm) | 3.8 cm | 2.9 cm |
Build & Design(2) | ||
Body Material | metal_plastic | Molded body with vinyl-coated shackle |
Product Weight (kg) | 0.45 kg | 0.5 kg |
Support & Warranty(1) | ||
Warranty Length (years) | lifetime years | 1 years |
Smart Features(1) | ||
Smart App Compatibility | none | Master Lock Vault Home and Enterprise Apps |
Security & Access(2) | ||
Lock Type | mechanical_dial | 4-digit combination |
Shackle Length (mm) | 36 mm | 46 mm |
Products in the top-left offer the best value (high score, low price).
Professional reviewers consistently rate the Master Lock Key Lock Box as a top pick for realtors and homeowners, praising its balance of security, capacity, and price.
Everyday users express high satisfaction with the product's reliability for granting temporary access to service providers, pet sitters, and cleaners.
“Perfect for dog walkers/cleaners-combo never fails in rain”
“Dial gets stiff in cold; needs WD-40”
Master Lock's official descriptions characterize the 5400D as a reliable key safe for home or rental use, emphasizing its secure, keyless access and anti-jamming design.
Official notes imply user-friendly operation and convenience for rentals and real estate, suggesting positive reception for its intended temporary access use cases.
