Massoth Hall Sensor, TLE4945L is a bipolar switch which connects directly via a three wire cable to the CLK 1 input on a Massoth decoder
To operate the Hall Sensor, a ring magnet is installed onto an axle inside the LGB loco’s gearbox.
Other options, include a 3D printed version, two part ring which clamps over an existing axle, without having to dismantle the loco gearbox, plus a printed holder for the KY-003 Hall Sensor Module to fit on the inside of the gearbox.
The A1344 Hall Sensor shown on the module has been discontinued and been replaced with a newer up dated A110x type, no differences as far as operation.
Hall Sensor A3144
Details can be found here LGB Hall Effect Sensor Mount and Sound Cam by Rob859