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Buying guide · Smart locks

Smart door lock buying guide: unlock methods, doors and batteries

How to choose a smart door lock for a home, office or hotel: fingerprint, PIN, card, face and app unlocking, door thickness, Wi-Fi models, batteries, emergency access and accessories.

  • 5 min read
  • Prices incl. GST

Updated November 2026. A smart door lock replaces keys with fingerprints, PIN codes, RFID cards, face recognition or a phone app. This guide walks through the Dorset and ZKTeco ranges we list: which unlock methods to choose, how to match the lock to your door, what changes between home, office and hotel use, and how batteries and emergency access work. Prices shown are current catalogue prices including 18% GST. Most ZKTeco models are price on request.

Which smart lock fits which door Wooden main door with a handle lock: Dorset DG 102, 104, 201, 202, 204, door 35 to 90 mm. Wooden main door with a pull handle: Dorset DG 400 series, 35 to 90 mm, DG 406 35 to 100 mm. Existing door with a rim lock: Dorset DG 906, 902, 904, 905, 30 to 60 mm for the DG 906 and 35 to 90 mm for the others. Glass door: Dorset DG 706, DG 705 (R) and ZKTeco GL300W, glass up to 14 mm on the DG 706 and 12 mm on the DG 705 (R). Cabinet, wardrobe or drawer: Dorset DG 303, 304, 308, 14 to 22 mm. Illustrative, not to scale Main door, handle lockMain door, pull handleExisting door, rim lockGlass doorCabinet, wardrobe, drawer Dorset DG 102, 104, 201, 202, 204Dorset DG 400, 402, 404, 405, 406Dorset DG 906, 902, 904, 905Dorset DG 706, DG 705 (R), ZKTeco GL300WDorset DG 303, 304, 308 35 to 90 mm35 to 90 mm30 to 90 mmup to 14 mm14 to 22 mm DG 406: to 100 mmDG 906: 30 to 60 mmglass, DG 706 Door thickness as listed for each range. Measure before you shortlist.
Door types and the door thickness each Dorset range lists.

Unlock methods compared

Every lock in this range supports more than one way in. Pick the methods that fit the people who will use the door.

  • Fingerprint: fast and nothing to lose. Dorset models use a 360° fingerprint reader that reads from any angle. Most handle locks store 100 users.
  • PIN code: useful for guests and domestic help. Look for an anti-theft password or anti-peeping code feature, which makes it harder for someone watching or checking smudges to learn your code.
  • RFID card or tag: the natural choice for offices and hotels. The Dorset DG Card costs ₹347, the DG Tag ₹347 and the DG STCR smart RFID sticker ₹262.
  • Face and palm vein: touchless options on premium models. The Dorset DG 205 adds 3D face recognition, while the DG 402, DG 405 and DG 406 add palm vein scanning.
  • Mobile app and OTP: lets you unlock remotely, issue one-time passwords and read the access log.
  • Mechanical key: the last-resort backup on most Dorset models and on the ZKTeco SL01-T430H.

Match the lock to your door

Door type and thickness rule out more locks than any other factor, so measure before you shortlist.

Door Suitable models Door thickness
Wooden main door, handle lock Dorset DG 102, DG 104, DG 201, DG 202, DG 204 35 to 90 mm
Wooden main door, pull handle Dorset DG 400, DG 402, DG 404, DG 405, DG 406 35 to 90 mm (DG 406: 35 to 100 mm)
Existing door, rim lock Dorset DG 906, DG 902, DG 904, DG 905 30 to 60 mm (DG 906), 35 to 90 mm (others)
Glass door Dorset DG 706, DG 705 (R), ZKTeco GL300W Up to 14 mm (DG 706), 12 mm (DG 705 (R))
Cabinet, wardrobe, drawer Dorset DG 303, DG 304, DG 308 14 to 22 mm

A rim lock mounts on the inside face of the door and suits doors where cutting a mortise is not practical. A mortise lock sits inside the door edge and usually gives a cleaner finish with more locking bolts; Dorset sells handle locks in 1 locking bolt and 3 locking bolt versions. For glass, the Dorset DG 706 (₹21,145) fits regular and sliding glass doors with fingerprint, card, PIN, key and app, and the DG 705 (R) (₹37,998) adds a remote. The ZKTeco GL300W supports Wi-Fi and fits sliding wooden doors, aluminium sliding glass doors and swing doors from 35 to 70 mm. Browse glass door locks for the full list.

Home, office or hotel

Home

For a flat or villa main door, a handle lock with fingerprint, PIN, card and key covers most families. The Dorset DG 102 starts at ₹10,891 and stores 100 users. Step up to the DG 104 (from ₹14,064) or DG 202 (from ₹18,710) if you want Wi-Fi and the app. For a visitor camera on the lock itself, the DG 204 Pro (₹29,369) and DG 905 (from ₹21,906) include an HD camera with two-way intercom. ZKTeco options for homes include the TL700W, ML100 and SL01-T430H. Compare models in home and office smart locks.

Office

Offices need audit trails, admin control and cards that can be added or cancelled quickly. The Dorset DG 501 (₹37,006) stores 200 fingerprints and 50 cards and connects over BLE. For a cabin or record room on an existing door, the DG 906 rim lock (₹9,903) takes PIN and card only. Glass cabin doors suit the DG 706. For storage, the DG 304 drawer lock (₹2,729) holds 40 fingerprints, and the DG 304 SL (₹2,772) is made for sliding cabinets and wardrobes. Larger staff locker banks may suit the ZKTeco LockerPad-G4 Pro, which controls up to 96 compartments by face or card. See cabinet and locker locks.

The ZKTeco iClock700 (₹28,065) is a fingerprint terminal with a 3.5-inch screen that drives a third-party electric lock, door sensor and exit button, so treat it as a door controller rather than a standalone lock. Our access control door setup checklist covers what such a door needs.

Hotel

Hotel locks work as a system: the lock, guest cards, a card encoder at reception and software. The Dorset DG 100 HL (₹9,975), DG 110 HL (₹13,303) and DG 111 HL (₹14,971) use Mifare 13.56 MHz cards and a key. The Dorset DG ENC card encoder (₹14,971) connects to a PC over USB. The encrypted DG MI S7 Mifare authentication card costs ₹864 and the DG MI DR data card ₹257. The DG ERS energy saver (₹2,695) switches room power on and off with the card, and the DG DTR-01 data retriever costs ₹35,931. On ZKTeco, the SL02-ZL140H hotel lock communicates over ZigBee through an SLG410 gateway, each gateway supporting 6 locks. Browse hotel locks.

App and Wi-Fi models

Dorset lists Wi-Fi as built in on the DG 104, DG 202, DG 204 Pro, DG 205 and DG 206, while the DG 203 Combo comes with a Wi-Fi gateway. The app gives mobile access, OTP access and logs. Dorset also sells the DG 20 Wifi gateway module at ₹4,325. On ZKTeco, the GL300W has Wi-Fi built in, the TL300Z needs a Zigbee gateway for remote access, and the ML300 needs a Bluetooth gateway and works with Amazon Alexa and Google Assistant. Check which hub or gateway a lock needs before you count on remote unlocking.

Batteries and emergency access

Smart locks run on batteries, so plan for the day they run flat.

  • Low battery alarm: Dorset models list a low battery alarm. Replace the batteries as soon as it sounds rather than waiting for the lock to stop.
  • Drained battery quick fix: Dorset locks accept an external power source when batteries are depleted; the DG 303 and DG 304 use USB Type-C. ZKTeco locks such as the TL700W, ML100 and HBL400 have a micro-USB emergency power port.
  • Mechanical key: keep the backup key outside the house, not on the inside of the locked door.
  • Battery type: the ZKTeco TL700W uses 4 AA alkaline batteries, the HBL400 a lithium battery, and the Dorset DG 402 two rechargeable Li-Poly batteries. ZKTeco quotes battery life of up to 3 years on the TL300Z and up to 1 year on the ML100.
  • Emergency exit: many Dorset models list an emergency exit feature for leaving quickly from inside.

Accessories worth adding

  • Extra cards or tags: Dorset DG Card at ₹347 or DG Tag at ₹347, and the DG STCR sticker at ₹262.
  • Remote unlocking: the Dorset RE DG 906/907 remote and receiver module (₹7,961).
  • Video door phone kits: the Dorset VDP DG 200 (₹8,256) and VDP DG 205 400 (₹8,256) receiver and transmitter kits. Several Dorset locks list video door phone connectivity as an option.
  • Wi-Fi gateway: the Dorset DG 20 Wifi module (₹4,325).

See all smart lock accessories.

Next steps

Measure your door thickness, decide on the unlock methods, then browse the smart locks range. For hotel projects, office floors or bulk orders, including the ZKTeco models that are price on request, use our request a quote page with your door count and door types.