Secure your property with the SDL-6, a surface mounted electronic rim lock designed for easy installation without complex door modification. This electronic rim lock mounts directly on the door surface, offering a convenient upgrade from traditional mechanical locks.   The SDL-6 offers five ways to unlock. Use your smartphone via the TTLock or Tuya app, touch the fingerprint sensor for instant access, enter a password on the keypad, tap an RFID card, or use the mechanical backup key for emergencies. The lock also features an optional indoor fingerprint reader and an optional wireless remote control on the Tuya version, giving you even more flexibility in how you access your door.   This electronic rim lock supports an impressive range of wireless protocols. Choose between Bluetooth BLE (with gateway support for remote access), WiFi, Zigbee, or optional 433MHZ. TTLock version supports voice control with Alexa and Google Home, while Tuya version offers built in WiFi for direct internet connection. Through the app, you can lock or unlock remotely, manage user credentials, share eKeys with family or guests, and view the complete audit trail of who accessed your door and when.   The SDL-6 is built for long lasting performance. The aluminum alloy housing with spray painting finish operates reliably in temperatures from -20°C to 60°C and fits door thickness from 35mm to 55mm. Standby current is an ultra low ≤50μA, and the 4 AA alkaline batteries last up to one year with typical use of 10 unlocks per day. A low battery alert warns you before power runs out, and the Micro-USB port accepts emergency power from any power bank.   Capacity varies by platform. The Tuya version supports up to 300 total credentials (fingerprint max 100, plus cards and passwords shared). The TTLock version offers 120 fingerprints, 1,000 RFID cards, and 250 passwords, making it suitable for families, small offices, and rental properties.   Security features include wrong password alarm that locks out after multiple incorrect attempts, anti peeping password function that lets you enter random digits before and after your real password so no one can see what you typed, and dual verification mode requiring two methods to unlock for added security.   Whether you need an electronic rim lock for your home, a fingerprint lock for your office, or a keyless entry solution for a rental property, the SDL-6 delivers the wireless flexibility, security, and ease of installation that modern users demand.