Latchbolt retracted by knob/lever from either side unless outside is locked by 20o rotation of thumbturn. Deadbolt thrown or retracted by 90 degree rotation of thumbturn. When locked, key outside or knob/lever inside retracts deadbolt and latchbolt simultaneously.
Outside knob/lever remains locked until thumbturn is restored to vertical position.
Throwing deadbolt automatically locks outside knob/lever. Auxiliary latch deadlocks latchbolt when door is closed. Inside lever is always free for immediate egress.
FOB Kaohsiung, Taiwan