Hi Kannis,
You will need the CP-7936-PWR-KIT= .Have a look at the following info;
Cisco 7936
Q. What are the specifications and cost of the power kit?
A. The power kits for the Cisco Unified IP Conference Station 7936 and the Cisco Unified IP Conference Station 7935 are the same. The Cisco Unified IP Conference Station 7936 includes the power cube, the power integration module, and LAN cords. The power cube AC cord and country-specific cord are optional. You can choose a cord choice for your country or region when you order. The power kit, CP-7936-PWR-KIT= is the part number for the power kit spare and works on both the Cisco Unified IP Conference Station 7935 and Cisco Unified IP Conference Station 7936.
From this doc;
http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00801f8e4a.shtml
CP-7936-PWR-KIT=
Replacement power kit. Includes power cube, PIM, and cables. This power kit also fits the Cisco Unified IP Conference Station 7935.
Note: Country-specific power cord not included
The power cube supplied with the 7936 power kit includes a 30-volt power connector for power connection on the PIM
The power cube-3 is rated at 15.5W of power at 48V DC nominal output.
Cisco IP Phone Power Cube 3
Support for Cisco IP Phones 7902G, 7905G, 7910G, 7910G+SW, 7912G, 7914=, 7940G, 7960G, and 7970G
Support for Cisco IP Phones 7971G-GE and 7985G
Hope this helps!
Rob
