<s>
NODE+	O
(	O
wireless	O
sensor	O
platform	O
)	O
is	O
a	O
first-generation	O
handheld	O
sensor	O
measuring	O
1	O
inch	O
in	O
diameter	O
and	O
3.75	O
inches	O
wide	O
that	O
communicates	O
wirelessly	O
through	O
low-energy	O
Bluetooth	O
4.0	O
with	O
Apple	B-Operating_System
iOS	I-Operating_System
devices	O
.	O
</s>
<s>
Mobile	B-Application
applications	I-Application
that	O
display	O
the	O
data	O
transmitted	O
by	O
the	O
NODE	O
can	O
be	O
developed	O
through	O
an	O
open	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
,	O
although	O
mobile	B-Application
app	I-Application
developers	O
must	O
obtain	O
a	O
commercial	O
license	O
from	O
Variable	O
Inc	O
.	O
prior	O
to	O
selling	O
a	O
mobile	B-Application
app	I-Application
that	O
uses	O
Node+	O
sensors	O
for	O
commercial	O
purposes	O
.	O
</s>
<s>
The	O
device	O
had	O
been	O
only	O
iOS	B-Operating_System
compatible	O
.	O
</s>
<s>
It	O
communicates	O
with	O
Bluetooth	O
2.1	O
or	O
Bluetooth	B-General_Concept
Low	I-General_Concept
Energy	I-General_Concept
.	O
</s>
