Intercom with sharp clear audio. Their is a tiny screw on the underside of the unit that you unscrew so you can get to this feature. I wired it up myself, so a pair of small wire strippers for the bell wire to make a connection makes it easier.
eBay
1Set Cabinet Closet Door Ball Catch Adjustable Door Latch Set Spring Roller Ball Door Stopper with Screws Furniture Hardware
Aliexpress UK
It effectively prevents the door from being opened from the outside. Child-Safe and Tamper-Resistant: This door blocker features a spring-loaded design that is child-safe and tamper-resistant. Install it higher on the door where children can't reach.
eBay
KERUI Motion Sensor Doorbell Door Chime for Business Store Door Visitor Entry Bell Detect Alarm Caregiver Reminder for Elderly
Aliexpress UK
It can be installed higher on the door where your children can’t reach! Plus, not only can doors not be kicked in by intruders, it protects against lock picking and bumping while in the locked position.
eBay
Mini Peephole Smart Wireless Door Viewer Camera PIR Motion Detection Smart Peephole Video Doorbell 2000mAh Digital Door Viewer
Aliexpress UK
Anti-Snap: The cylinder has sacrificial cuts that will snap if the cylinder is subject to attack. We can provide a variety of sizes with a thumb turn. The "T" represents the thumb turn, so if you require a thumb turn on the 35mm side of a 35/45 cylinder, you would need to select a "T35/45".
eBay
Master Keys Skeleton Lock Hook Warded Pick Open Doors Key Set Tools for Door Lock Opening Keychain Master Key To Open All Doors
Aliexpress UK
Red Signs for Fire, Fire Blanket, Hose, Alarm - PROHIBITED STOP DO NOT! Blue Signs for Mandatory, Kitchen, Construction Sites YOU MUST DO THIS! Multi Signs suitable for Construction and Building sites, Tree Protection.
eBay
25 Pcs/Set Door Handle Screws - Through Fixing Bolts for Door Handle Roses, Knobs & Door Lock Metal Hardware
Aliexpress UK
4TRESS ® White High Security Shed Garage Gate Van Side Rear Door Anti Theft Lock. Mount the 4TRESS® Van Lock using the coach bolts and locking nuts provided. Tighten securely. 4TRESS Lock includes 3 keys.
eBay
ABJN-2MP 1080P Dual Lens Wireless WIFI IP Doorbell Video Door Phone Intercom Visual Door Viewer Camera Peehole Viewer
Aliexpress UK
Premium durability, the main components of this latch are constructed with high-quality aluminum alloy, long-lasting strength and sturdiness. 1 x Automatic latch. Enhances security, providing an extra layer of for protection for your doors and SASH, effectively deterring unauthorized for access and bolstering the overall security of your space.
eBay
New 3 In 1 Automatic Self Closing Door Hinges with Positioning 90 Degrees Integrates Spring Hinge, Door Closer and Door Stopper
Aliexpress UK
French doors : Features an adjustable sliding lock bar to fit door handles at different spacings. Compatible with standard French double-door with round door knobs, straight lever door handles. It effectively prevents door handle manipulation (to stop unauthorized entry/exit) and resists forced kicks from the outside.
eBay
Handles Door Stopper Silicone Gel Door Stop Transparent Wall Protection Door Knob Bumper Furniture Protector Pad Handle Buffer
Aliexpress UK