Karma KP-25.2, Owner'S Manual

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3. Long-range transmitters and transceivers, such as commercial broadcast
transmitters (radio and TV broadcast antenna towers) and amateur (HAM)
radios.
NOTE:
Other types of hand-held devices (cordless phones, laptop computers, AM/FM
radios, TV sets, CD players, cassette players, and small appliances such as
electric shavers and hair dryers, et cetera) so far as we know, are not likely to
cause EMI problems.
Powered Vehicle Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the
transmitting antenna (source), the EM fields from hand-held radio wave sources
(transceivers) are of special concern. It is possible to unintentionally bring high
levels of EM energy too close to the powered vehicle's control system while
using these devices. This can affect your powered vehicle's movement and
braking. Therefore, the warnings listed below are recommended to prevent
possible interference with the control system of the powered vehicle.
Warnings
Electromagnetic interference (EMI) from sources such as radio and TV stations,
amateur radio (HAM) transmitters, two-way radios and cellular phones can affect
powered vehicles and motorized wheelchairs.
Following the warnings listed below should reduce the chance of unintended
brake release or powered vehicle movement which could result in serious injury.
1. Do not operate hand-held transceivers-receivers such as citizens band
(CB) radios or turn ON personal communication devices such as cellular
phones, while the powered vehicle is turned ON.
2. Be aware of nearby transmitters, such as radio or TV stations, and try to
stay away from them.
3. If unintended movement or brake release occurs, turn the powered vehicle
OFF as soon as it is safe.
CAUTION:
Some stores may have automatic (sensor) doors and alarm systems set at
certain frequencies that might affect your powered wheelchair.
4. Be aware that adding accessories/components or modifying the powered
vehicle may make it more susceptible to EMI. There is no easy way to
evaluate their effect on the overall immunity of the powered vehicle.
5. Report all incidents of unintended movement or brake release to your
powered vehicle dealer or KARMA, and note whether there was a source
of EMI nearby.