Welch Allyn CP 50 Plus 12-lead resting electrocardiograph - User Manual - Manual (Page 10)

Power symbols
(LED off) No AC power is present. Battery absent or faulty.
(LED green) AC power is present, and
battery is charging. (LED amber) AC
power is present, and battery is charging.
Battery is charged to the indicated level.
Alternating current Battery is charging
Dangerous voltage Battery door
Fuse Rechargeable battery
Protective earth Nonionizing electromagnetic radiation
Equipotential terminal Lithium ion
Connectivity symbols
USB Ethernet (RJ-45 )
Shipping, storing, and environment symbols
This end up Keep dry.
Fragile Relative humidity limit
Temperature limits Atmospheric air-pressure limits
6 Introduction CP 50™ and CP 50 Plus™ 12-lead resting electrocardiograph