The ultrasonic probe is an accessory of the ultrasonic equipment and has the same expiration date as the overall unit.

The alarm occurs because the heat generated during normal operation of the equipment cannot be effectively discharged from the inside. Please clean the dust screen at the bottom of the machine so as to dissipate heat.

The main reason is that excessive coupling agent sticks to the trackball, affecting sliding of the trackball. Please rotate the plastic ring around the trackball, take out the trackball, clean the trackball using a dry soft cloth, and then install it back for use.