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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23
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Description
Bluetooth 1-29/32 in. Wide Zinc Indoor Personal Use PadlockThe Master Lock No. 4400D Bluetooth Smart Padlock features a 1 29 32 in. (47 mm) W metal body for durability. The 9 32 in. (7 mm) Dia shackle offers 7 8 in. (22 mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. The smartphone app interface offers speed, ease of use and greater control with the ability to share access, with keyless convenience. The locking mechanism features anti shim technology,
The Master Lock No. 4400D Bluetooth Smart Padlock features a 1-29/32 in. (47 mm) W metal body for durability. The 9/32 in. (7 mm) Dia shackle offers 7/8 in. (22 mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. The smartphone/app interface offers speed, ease of use and greater control with the ability to share access, with keyless convenience. The locking mechanism features anti-shim technology, offering maximum security. The 1-Year Limited Warranty provides peace of mind from a brand you can trust.- Use your smartphone to open your lock with the free Master Lock vault elocks app for Android and iOS. Designed for personal use, supporting up to 10 locks
- Never worry about a forgotten combination
- Share access with others - temporary or permanent
- Share 24/7 access or limit to days or nights
- Monitor access history and receive tamper alerts
- Backup access using directional code on lock keypad
- 2-piece weather cover for maximum outdoor protection
- Low battery notification and reminder on padlock and in app
- Comes with easy to replace CR2 battery
- Battery jump allows for temporary access if battery dies while locked
- Locker mode setting allows for storage inside a locker
- Hardened boron alloy shackle for superior cut resistance
Features
| Item Weight | .506 |
| Keys & Accessories Product Type | Padlock |
| Lock Type | Electronic |
| Adjustable shackle | No |
| Coated | N |
| Color | SILVER |
| Color Family | Black |
| Lock material | Zinc |
| Hub Required | No hub connection available |
| Returnable | 180-Day |
| Requires Hub? | No Hub Required |
| Locking mechanism | Ball bearing |
| Remote Access | No Remote Access |
| Power Options | Battery |
| Smart Home | Smart Home Enabled |
| Weatherproof | No |
| Works With | Proprietary App |
| Product Weight (lb.) | .506 |
| Material | Zinc |
| Number of locks in pack | 1 |
| Shrouded shackle | No |
| Lock Product Type | Padlock |
| Smart Home Protocol | Bluetooth |
| Voice Control Hub Required | No Voice Control |
| Product Width (in.) | 1.85 |
| Body width (in.) | 2 |
| Product Height (in.) | 3.15 |
| Shackle diameter (in.) | 0.281 |
| Shackle clearance (in.) | 0.875 |
| Product Depth (in.) | 1.06 |
| Manufacturer Warranty | 1 Year Limited |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
Comfortable
These are very comfortable to wear
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 3, 2026
★★★★★ 5
Love these socks!
The wife struggles with socks. She only like the Nike ones, then they discontinued them, so had to start the search again! Found these, they are expensive just like the Nike, but the size is true, they look great, they are super soft and stretchy. They are light weight and breathable and seem to wick away moisture. She loves these!
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Reviewed in the United States on November 18, 2025
★★★★★ 5
I stay on your foot they don’t slip in your shoe
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
This is the only socks I wear Under Armour because they stay in place I wear a size 8, but they’re more comfortable with a large instead of a medium, but I wear both because I have them already and you can pull them to stretch them out a little bit
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Great fit, truly doesn’t slide off heel
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium, Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
I’ve scoured all the lands looking for a no-show sock that was 1) thin, 2) quality, soft, breathable material, 3) didn’t dig into my feet/heels, 4) doesn’t shrink, and most importantly 5) stays on the back of my heel without a bulky non-slip rubber piece and these check all the boxes! Perfect for low profile women’s work shoes like Keds, etc. Not low enough for most flats though. I wear a women’s size 9.
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Reviewed in the United States on April 19, 2025
★★★★★ 5
So good - I’m buying MORE.
Number of Items: 3, Color: White (3-pairs), Size: Medium
I’m gonna give you more detail than you need about why I’m buying these socks again.
I’ve been the mom of girl athletes. I’ve been a model and a fashion director. I’ve worn every brand of shoe on the planet and never found a shoe that did NOT find a vulnerable spot on my foot to rub raw. Even my beloved white Jack Purcell sneakers.
With that said - I don’t like socks. I’ve bought a TON of them in 35+ years.....all major brands.
They shift. They lose their shape. They get holes in them and wear out too fast. Not these.
I retired this year, and knowing I’d be in sneakers a lot, traveling, sightseeing ......
I bought these 6 months ago and have worn them constantly. I’ve traveled with them. I’ve washed them in hot water and bleach.
The socks are like brand new. They are exactly the right cut so as not to be seen in a basic sneaker. The little silicone patch on the heel stays put. Not once have I had to dig down into my shoe and pull the sock back up. The socks have stayed soft and EXACTLY the same as the day they were new.
Like I said - I am back to buy them again. Great quality!
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Reviewed in the United States on January 20, 2021