GO2 are manufactured to the same technical specifications and technology used in NONIN professional oximeters, but are dedicated to consumers for people suffering from shortness of breath, fatigue or limited activities. - highly resistant: it is tested to resist 25 times to fall down from 1 meter, to liquids and to continuative use - patient oriented display - finger size range from pediatrics to adult - easy to read perfusion indicator - suitable for low perfusion patient Other manuals for download: GR, PL, DK, NO, SE, FI. Back light display 2400 tests performed with one AAA battery (21 hours continued use) Lead (PB) free and latex free