The PS- x25T/TU/LT can be ordered with two types of metal enclosures, with built-in speaker module and different AC mains transformer components to meet international standard requirements.

For proper operation, the unit should be tested at least once a year as described below: Output voltage test: Check DC output for proper voltage level under normal load conditions. Battery test: Check specified voltage, at both battery terminal and board terminals marked [+VBAT and 12VDC (-)] under normal load conditions, verify that the battery is fully charged and insure there is no break in the battery connection wires.