Remove both exhausted AAA batteries and replace them with fresh alkaline cells. Dead batteries or incorrect installation.

guide, he wrapped the cuff around his on bare skin. He positioned it about 1 to 2 cm (roughly a finger's width) above his wrist joint, ensuring the screen was facing him on the inner side of his wrist. Chapter 4: The Heart Zone

: Insert 2 AAA alkaline batteries into the compartment on the bottom of the device, ensuring correct polarity ( −negative Cuff Placement :

The device console consists of a multi-line LCD screen and three buttons: