

🛡️ Lock down your space anywhere, anytime — because safety shouldn’t wait.
The DoorJammer DJ3 is a police-accredited, patented steel security device designed exclusively for inswinging doors with a 3mm clearance. Lightweight and compact at just 210g, it installs tool-free in seconds, anchoring firmly on all floor types to prevent forced entry. Tested to PAS24 standards, it offers professional-grade protection with a quick-release feature for emergencies, making it the ultimate portable security solution for home, travel, or work.













| ASIN | B07HM7X6TT |
| Best Sellers Rank | 2,190 in DIY & Tools ( See Top 100 in DIY & Tools ) 59 in Door Hardware & Locks |
| Brand | Door-Jammer |
| Colour | Red |
| Country of Origin | China |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,680) |
| Finish | Glossy |
| Item Dimensions L x W x Thickness | 7L x 4W x 10.8Th centimetres |
| Item Weight | 210 Grams |
| Manufacturer | Penn-Elcom |
| Material | Alloy Steel |
| Mount Type | Under Door Mount |
| Product Style | Modern |
| UPC | 814953024170 |
| Unit Count | 1.0 Count |
S**E
Handy security to have
Very easy to install and works on a large variety of door types. Latches do not matter with this. It's very sturdy when installed and will provide resistance for intruders. Packs away nicely into a suitcase or handbag.
I**M
Good product!
Good product. Both my partner and I have used this when staying at hotels. Easy to use and seems to be effective. Plenty of other hotel door security products don't really work, or are hit and miss with which doors they work on, but so far this has been good everywhere.
H**D
Good Quality
I have used it for 2 weeks now on daily basis. Quality is good, it is strong and locks the door securely. It is light weight and robust.
C**E
Good on most doors
So, for some doors this is useful. its a bit fiddly to set up at times and occasionally I've been nervous that it might damage the hinges (as depending on how the top of the door sits along with the rubber wedge at the top you sometimes have to hoist it up quite far before it is a tight fit and doing so lifts the door up). It doesn't work for all doors - it won't work if there is a draft excluder at the bottom, thick carpet, or if the top of the door is fitted further out from the frame. It has worked on more than half of doors I've tried it on and I'll continue to take it on holiday with me. I don't think it would stop someone breaking in but I feel like it would prove some resistance and happy that it would slow down and make enough noise pushing against it (plus a chair i usually put in front of the door) that I'd hear it. I was concerned in an emergency it would be fiddly to remove but it's been okay for me - but this might be an issue if you had mobility issues reaching to the ground or had impared finger dexterity. Similarly dexterity is needed in setting it up. This is the third temporary (/hotel) door security I've tried and the best of the three types: one was one that fits over the lock on the side of the door before shutting it and this was pretty useless in the UK on the various doors I tried and I returned it. The other was a wedge that fit under the door and would in theory set off an alarm if the door opened and pressed into it - for most doors there either wasn't enough room to fit it under OR it would just get pushed away and not trigger. So this one is the one - the red product on this page - is the one I have kept and actually continued to take on trips.
P**N
Good, but the instruction booklet is incorrect
Seems to work fine, worth £25 for the peace of mind after a recent report of illegal entry into a woman's hotel room. Tested on our wood floor, the emergency release works well too. However, the instruction booklet is wrong. It says turn to the left, ie anti-clockwise, to tighten & to the right, clockwise, to loosen when in fact you need to do the opposite, clockwise to tighten, anti-clockwise, to release.
M**Y
Great item
This is a really great item, I bought it to take on breaks to travelodges which don’t have internal locks. Used it last week and it works very well, very easy to fit, apart from having to bend down to fit it, not my favourite thing to do and can make me a little dizzy. Not the product’s fault though. Nicely packaged and good instructions provided. Just turn the large plastic nut until you feel the door seem to “lift” just a little, I found on trying the door handle it was firmly locked. I did not try the quick release so don’t know how well that works, I must remember to try it next time, but a few quick spins of the plastic nut quickly released it. It feels sturdy and well made to me. I’m very pleased with my purchase.
T**3
Needs more work.
I initially found this product appealing; however, upon continued use, several flaws have become apparent. 1. Stability Issues - When tightening the device against the door or floor, it tends to skew to the left, which affects stability. Even with my thumb positioned in the center for support, the left side pushes in while the right side pulls out. An increase in width at both the top and bottom would enhance stability. 2. Slip Resistance - The grip on the underside of the device is insufficient for many slippery floor types. When tightened, it tends to slide, even with the additional attachment. Incorporating a material with a more textured, sticky surface would be beneficial. 3. Joint Flexibility - Over time, the small arm of the device has gradually shifted to the left, likely due to the pressure applied during tightening. This suggests that the arm requires a stronger joint, as the existing hinges exhibit excessive play. A more rigid connection would improve performance. 4. Screw Performance - The screw mechanism becomes increasingly stiff and sticky with use, indicating potential manufacturing inconsistencies in the threading. Initially functional, it has degraded to a point where it's more difficult to operate than at first. While this device is compact and convenient for travel, there's considerable potential for improvement. Enhancements such as a thicker pin, a stronger arm, a tighter joint on the arm, wider dimensions, and additional components tailored for various floor types would significantly elevate its effectiveness. On a positive note, the rubber pieces designed for the head of the door effectively compress the door into the outer frame, provided a solid grip is achieved on the floor. Overall, this product has room for simple significant enhancements. Well worth a new revision!
S**.
The best safety tool for a solo traveller
Very good device, it’s small enough that I can take it with me in my hand luggage. And it works, it gives me such a good peace of mind as a solo traveller. I’ve used it for every trip and it does the job perfectly, no I can’t dream of travelling anywhere without it
C**.
This product is great and works exactly as it should. I have high gloss tiles and have no problem with it sliding along the tiles if someone is trying to open the door on the other side. It adheres well to my tiles and doesn’t move at all, thereby preventing entry by someone.
U**O
Si quieres abrir una puerta con esto puesto... Tienes que romper la puerta entera. Era muy escéptico con este producto, pero realmente cumple muy bien. Lo pongo cuando no quiero distracciones en casa y necesito concentración
A**I
Perfect for safety for solo women travellers. Insert this and feel safe, whenever u are travelling alone, especially in hotel rooms that don’t have additional chain locks.
L**Z
Nunca recibí el pedido
J**A
Got me extra protection at my hotel room It worked excellent
Trustpilot
2 weeks ago
1 week ago