5 in 1 Keyless Unlock --- ① Numeric Code: Support 10 password memories, 1 of them with administration function; ② RFID Card --- 3 cards included (up to 20 authorized); ③Bluetooth; ④WiFi, with WiFi box; ⑤ USB emergency unlock (if the battery is low, use the USB port to turn on and connect the app with automatic unlock, without charging function). ✅ For doors with thickness 30 – 70 mm --- Knob diameter: external 44 mm / internal 38 mm; length: external 56 mm/internal 56 mm. Length of electronic locks: adjustable outside 30mm - 40mm / inside 30mm - 60mm. Suitable for all doors with thickness between 30mm and 70mm. This cylinder allows you to upgrade many doors without having to be set to a fixed division already at the time of purchase. Safety/Low Battery Reminder: If the battery is less than.
eBay