The AL624 is a linear power supply/charger that converts a low voltage AC input to 1.2 amps of continuous supply current @ 6VDC or 12VDC or. 75 amps of continuous supply current @ 24VDC. The AL624 comes with a built-in charger for sealed lead acid or gel type backup batteries. The device automatically switches to battery backup power when AC power is interrupted. This power supply/charger is ideal for use in access control, security, and CCTV systems. Also known as -Altronix Corp. 6/ 12VDC, 1.2AMP 24VDC, 750MA BD - AX-AL624-Altronix AL624 Proprietary Power Supply - Wall Mount