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introduce further mounting complications. Another option is to use a device such as the

Micro CommPac or Gewa Mini Amplifier. The GEWA amplifier (available through ZYGO)

comes in three different models; (1) with only amplifier, (2) with both amplifier and

possibility to connect switches and (3) including amplifier, connection for switches and a

built in IR-transmitter for environmental control.

Figure 3: GEWA Mini Amplifier. (Picture from http://www.gewa.se/svensk/laddahem/Manualer/809060.pdf, accessed 12/5/2004)

If intending to use the standard laptop speakers it pays to listen to and compare brands, as

there can be a substantial difference in the quality and volume of output. The Compaq

laptops for example provide superior audio features (volume and quality) to many others

and this may be adequate for some communication purposes.

How often do they use the device? How long must it be turned on? What power

sources are available?

Most laptop computers have a battery life of only 2 to 4.5 hours but, as with sound, it pays

to compare brands. For example, the Compaq Evo N620c notebook claims up to 6 hours

of battery life (10 with an additional battery), which is double that of the Dell Performance

Latitude C840, which only claims 2½ -3 hours. Bear in mind that this stated battery life is

the maximum, and in reality will always be less.

Users who require extended use will need to use either a mains supply or, if available, a

wheelchair battery. Use of the wheelchair battery will require a wheelchair power adaptor

(this is integrated with the Mercury system) and the drawback is that it reduces the drive

time of the wheelchair. If this is an issue then it may be necessary to add an additional

power pack to supply the laptop. Most laptop manufacturers offer an optional automobile

battery adaptor at an additional cost (Compaq is $135), but be aware that this requires a

12-volt input, whereas wheelchair batteries will generally provide 24 volts. A custom laptop

power supply, that converts a 24-volt wheelchair supply to the required laptop input

voltage, can be purchased for around $200, and this is probably the best option to pursue

if powering directly from a wheelchair.

What issues arise concerning mounting?

Most ‘off the shelf’ A.A.C. devices have a mounting plate attached, however the need to

buy compatible mounting systems can elevate the cost of mounting the device on a

wheelchair. If the communication device is going to be tray mounted then it is often

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