HeschenM30 Inductive Proximity Sensor Switch, Non-Shield Type, LJ30A3-15-Z/AX, Detector 15mm, 10-30VDC 200mA, NPN Normally Closed(NC), 3 Wire

Heschen M30 Inductive Proximity Sensor Switch Non-Shield Type LJ30A3-15-Z/AX Detector 15mm 10-30VDC 200mA NPN Normally Closed(NC) 3 Wire

WEICHUANG 3PCS DC 3-24V 90dB Active Piezo Electronic Buzzer Beep Tone Alarm Ringer Continous Sound (Black) SFM-27-W

LAMPVPATH (Pack of 2) 9v Battery Holder, 9 Volt Battery Holder with Switch, 9v Battery Case with Switch