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Optelec
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Page 36
10. Mounting the Braille Audio Feature Pack
The ALVA BC640 Braille Audio Feature Pack clicks onto the back of the ALVA
BC640 after which it will be secured with two 2.5 mm hex screws (see picture below).
1. Switch off the ALVA BC640
2. Click the Feature Pack to the ALVA BC640
3. Tighten the 2 Feature Pack screws with the 2.5 mm hex key