When the hammer safety leaves the safety hammer holder, the switch button ejects, and the circuit is connected, so the sounder issues an alarming signal.
当安全锤离开安全锤座时，开关按钮弹起，电路连通，此时发声器发出报警信号。
When the hammer safety leaves the safety hammer holder, the switch button ejects, and the circuit is connected, so the sounder issues an alarming signal.
当安全锤离开安全锤座时，开关按钮弹起，电路连通，此时发声器发出报警信号。
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