door lock bar
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They are fully mechanical and battery-free. No charging or batteries are required — the locks operate manually.
Listings include both single units and multi‑packs. Examples in the results: some chain lock sets are sold as three‑packs, the travel lock appears as a two‑pack, and many bars/locks are offered as single units.
Some models are described as weather‑resistant. For example, certain zinc‑alloy mechanical locks list corrosion‑resistant electroplated coatings and are described as waterproof/rustproof, and at least one bar listing explicitly notes outdoor use compatibility.
Installation varies by product: some portable travel locks install tool‑free (slide in and secure), while most door‑mounted devices require screws and typically only a screwdriver. Several chain lock sets include the mounting screws.
Portable travel locks are designed for most inward‑swinging residential doors (common in hotel rooms, apartments, and private rooms). They are generally not compatible with outward‑swinging doors, double doors, or sliding doors.