AASTRA DT292 for MX-ONE User Guide EN - Manual (Page 9)

9 DT292
Important User Information
Intrinsic safety
The DT292 phone is not specified as intrinsically safe, so do not
use it in areas with a danger of explosion.
Preparing for use
Before using the DT292 the first time you have to charge and
connect the battery , see section “Preparing for use” on page 91 .
Note: Place the DT292 in the charger and charge it for at
least 4 hours before using it the first time.