SONOFF DW2 Wi-fi Wireless Door Window Sensor ISD1820 3-5V Voice Module Recording And Playback Module with Microphone and 0.5W Speaker A 16-tooth pulley has a

A 16-tooth pulley has a smaller diameter

consider adding an inline switch or fuse between the holder and your circuit to control power and prevent overcurrent

Ready-to-Build - All components included for immediate assembly

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SONOFF DW2 Wi-fi Wireless Door Window Sensor ISD1820 3-5V Voice Module Recording And Playback Module with Microphone and 0.5W Speaker A 16-tooth pulley has aSONOFF DW2 Wi fi Wireless Door Window Sensor The SONOFF DW2 is a Wi Fi enabled wireless door and window sensor that detects opening and closing events through magnetic reed switch technology, transmitting real time alerts to your smartphone via the eWeLink app. Security professionals, facility managers, and home automation enthusiasts rely on this device to monitor entry points, track unauthorized access, and integrate door window status into