3pcs KY-024 4pin Linear Magnetic Switches Speed Counting Hall Sensor Module Geekcreit for Arduino -

Features: ? 1. has the signal output instructions. 2. single signal output. 3. effective signal output for low level. 4. sensitivity adjustable pure tone . 5. have the field cuts have signal output 6. circuit boards output switch quantity! (can be directly by ) ? Package Incuded: ? 3 x KY-024 Hall Sensor Module