Remove the protective tab to activate the battery. 3 Get started To replace the battery: C $ % & B Warning " #$ " Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. Perchlorate Material-special handling may apply. See www.dtsc. ca.gov/hazardouswaste/perchlorate. The battery contains chemical substances, so it should be disposed of properly. The button cell battery cannot be swallowed. Keep children away from the battery. Note You can only use AC power as power supply. The lithium CR2032 battery is only for back-up purpose.
When power is disconnected, the display backlight is off.