| Mechanical Key Lock | Metal key | A correctly cut key operates the cylinder directly. | ★★★☆☆ | ★★★☆☆ | None unless keys are manually logged. | No battery or network connection required. | Simple operation, low technology dependence, and predictable emergency access. | Lost or copied keys can remain usable; access rights are difficult to change quickly; no automatic entry record. | Small properties, back-of-house doors, and applications where electronic access is unnecessary. |
| Magnetic-Stripe Card Lock | Encoded magnetic-stripe card | The lock reads coded information stored on the card’s magnetic stripe. | ★★★☆☆ | ★★★☆☆ | Usually available in the lock or management system, depending on the installation. | Battery-powered; normally operates offline at the door. | Cards are inexpensive, easy to issue, and access permissions can be changed without replacing the lock. | Cards can be demagnetized or physically worn; the stripe is exposed to copying and reader wear; the technology is older than contactless systems. | Existing properties with compatible legacy infrastructure and basic electronic access requirements. |
| RFID or NFC Contactless Card Lock | Contactless smart card or key fob | The reader communicates wirelessly with a chip embedded in the credential. | ★★★★☆ | ★★★★☆ | Commonly supported through the lock system or front-desk software. | Battery-powered; many hotel implementations work offline and synchronize when serviced or connected. | Cards do not require physical contact, are more durable than magnetic-stripe cards, and can support encrypted credentials and time limits. | Requires compatible readers, credential-management equipment, battery maintenance, and correct encryption and key-management practices. | Most full-service hotels seeking a balanced combination of security, reliability, and ease of use. |
| PIN or Keypad Lock | Personal identification number | The guest enters a valid code on a keypad. | ★★★☆☆ | ★★★★☆ | Possible when the lock records code use; capability varies by model. | Battery-powered; may operate offline or connect to a management platform. | No physical card is required, and codes can be created for specific rooms, users, or time periods. | Visible keypads may reveal worn buttons; shared or reused codes weaken security; guests may forget codes. | Suites, serviced apartments, small hotels, and selected staff or amenity areas. |
| Bluetooth or Mobile-Key Lock | Smartphone with an authorized mobile key | A mobile application communicates with the lock using short-range wireless technology. | ★★★★☆ | ★★★★★ | Usually supported through the mobile-key and property-management platform. | Battery-powered at the door; mobile-key delivery requires a compatible phone and normally depends on backend systems for issuance. | Can support contactless arrival, remote issuance, time-limited credentials, and reduced plastic-card use. | Requires phone compatibility, sufficient battery power, correct app setup, cybersecurity controls, and a fallback process for lost or uncharged phones. | Modern hotels prioritizing contactless service, mobile check-in, and integration with digital guest services. |
| Biometric Lock | Fingerprint, facial, or other biometric identifier | The reader compares a biometric characteristic with an enrolled template. | ★★★★☆ | ★★★☆☆ | Possible when the system records successful and failed authentication events. | Requires electrical power; network requirements depend on whether matching is performed locally or centrally. | Guests do not need to carry a card or remember a PIN, and credentials are difficult to transfer intentionally. | Enrollment, privacy, accessibility, hygiene, false rejection, data protection, and fallback-access issues require careful management. | Restricted staff areas, premium facilities, and properties with a clear legal and operational basis for biometric use. |