1. Open the battery door with a screwdriver. 
  2. If used batteries are present, remove these batteries from the unit bypulling up on one end of each battery. DO NOT remove or installbatteries using sharp or metal tools. 
  3. Install new batteries as shown in the polarity diagram (+/-) inside thebattery compartment. 
  4. Replace battery door securely. 
  5. Check your local laws and regulations for correct recycling and/orbattery disposal.