Nonin GO2 Guide D'utilisation page 6

Battery
Indicates separate collection for electrical and electronic equipment (WEEE).
Protected against spraying water and against access to hazardous parts
IP33
with a tool, per IEC 60529.
SN
Serial Number
Sensor disconnect; the pulse signal is not detected or there is excessive motion.
EC REP
Authorized Representative in the European Community
+70°C
Temperature Limitation for storage/shipping
-30°C
3