• Universal for various door opening directions.
• Multiple unlocking ways including linkage, knob, key, etc.
• Automatically locks if the door is not opened within 15 seconds of being unlocked.
• Auto locking after door closing, no door slamming, no noise.
• Low power consumption: Only 1/5 of the power consumption of electric locks.
• Long lifetime of 350,000 cycles.
• Audible alerts for door unlocking and closing.