This is an APC BX1600MI-MS Uninterruptible Power Supply (UPS) rated for 1600VA and 900W. It operates with a nominal input voltage range of 220-240V and a frequency of 50/60Hz.
System Voltage: 24V
Amp-Hour Rating: 7.0 Ah (7000 mAh)
Internal Setup: Composed of two standard 12V, 7Ah sealed lead-acid batteries wired in a series loop