Cisco CP-PWR-CUBE-4, a Cisco Unified IP Endpoint Power Cube 4 - power adapter. AC 100-240 V ( 47 - 63 Hz ). Unified IP Phone 8941 Slimline, 8941 Standard, 8945 Slimline, 8945 Standard, 8961 Slimline, 8961 Standard, 9951 Slimline, 9951 Standard, 9971 Slimline, and 9971 Standard.