Pyle PPDM1 Instruction Manual page 4

WEARING THE TRANSMITIER BELT
Adjust the elastic belt so that it fits tightly around your chest just
below the pectoral muscles. Moisten the transmitter's conductive
pads with saliva or ECG-gel (available at your local chemist's) in
order to ensure a good contact wi th the skin at all times.
Positioning the Transmitter Bell upward as per diagram.
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conductive pads conductive padS