Hi Yong1794,
The (AIR-PWRINJ3) will work with the AP350 but you could also use the cheaper (AIR-PWRINJ). Have a look;
The voltage requirement for the 350, 1100, and 1200 series is 48 V.
You can connect these devices to the 350, 1100, and 1200 series of products:
Caution: You can only use the Cisco Power Injector with these devices:
BR350 (AIR-PWRINJ)
AP350 (AIR-PWRINJ)
AP1100 (AIR-PWRINJ3)
AP1200 (AIR-PWRINJ3)
From this doc;
Power Options
Aironet 350 Series APs
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_tech_note09186a00800946e7.shtml#AP350
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Cisco Aironet Power Injectors provide inline power for Cisco Aironet 1100 and 1200 series access points and 350 series access points and bridges. Three models are available:
AIR-PWRINJ—for 350 Series access points and bridges.
AIR-PWRINJ3—for 1100 and 1200 Series access points.
AIR-PSINJSYS1200—for 1200 Series access points.
Note** The 1100 and 1200 series power injectors can be used with 350 series devices, but due to the higher current demands of the 1100 and 1200 series, the 350 series power injector cannot be used with 1100 and 1200 series devices.
From this doc;
Installation Instructions for Cisco Aironet Power Injectors
http://www.cisco.com/en/US/products/hw/wireless/ps4570/prod_quick_installation_guide09186a00800a3fe1.html
Here is a link to a supplier for the part you need.
(AIR-PWRINJ) Cisco Systems 350 Series Powerline Injector
Current cost is $41.99US
http://www.superwarehouse.com/Cisco_Systems_350_Series_Powerline_Injector/AIR-PWRINJ=/p/7263
Or;
(AIR-PWRINJ3) Aironet Power Injector for 1100 & 1200 Wireless Access Points
Current cost is $48.95US
http://www.pcmall.com/pcmall/shop/detail~dpno~323749.asp
Hope this helps!
Rob
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