The sensors use Bluetooth Low Energy (BLE) to communicate with the iPad/iPhone, which allows them to have a longer battery life and to be connected without having to manually pair the sensors. As with all radio communication devices, they are susceptible to interference from radio sources near the same frequency (2.4GHz) and from signal blocking from solid objects (generally metal).
Proximity between the sensors and the iPad contributes to the signal strength
#Possible sources of interference:
- Two-way radios - particularly if people nearby are wearing them (including the person performing the task being assessed), or are used extensively on the site
- Microwaves
- Electric motors
- Electric welders
- Powerful WIFI networking equipment
#The signal can be blocked by:
- Metal grating/mesh - the sensors generally won't connect at all if a metal mesh is between the sensors and the iPad/iPhone
- Water - this includes human bodies; if there are people between the sensors and the iPad/iPhone this will reduce the radio signal
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