Stainless steel 2.0mm, Motor: stepping motor, Lock Gear: Metal, Unlock Modes: Auto, mute. Key: ... Control \ mechanical keyKey Capacity: 1000Open the door: Magnetic detection, motor drive, automatic lock, muteVoltage: 12V DCInstallation: big left, right, ... of Micro-stepping motor drive, more stable performance, the circuit board through multiple performance test, stable and reliable, in line with 3C, ...