HTKP-820V HTKP-820S HTKP-824 HTKP-48HD HTKP-66D     • SPECIFICATION SWITCHING SPACE DIVISION AC INPUT/ EXT BATT. AC INPUT:220V/60HZ EXT BATT:24V/10AH SIZE 460(L)x380(W)x82(H) CAPACITY MAX:28 MAX C.O LINE:8 MAX INTERCOM LINE:20