Your search for "ma-inj-4-us" revealed the following:
NEW Cisco Meraki CW9172I 802.11be Wi-Fi 7 Omnidirectional Antenna Indoor WAP
SKU: NSN-2667
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,368.99
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NEW Cisco Meraki MA-INJ-4-US 802.3at PoE+ Injector 30W US Plug
SKU: NSN-9286
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco MA-INJ-5-US Meraki MR86 Series PoE Wireless Access Point Injector
SKU: NSN-6133
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco MA-INJ-5-US Meraki MR86 Series PoE Wireless Access Point Injector
SKU: NSB-6691
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MR86-HW Wi-Fi 6 External Ant Unclaimed Outdoor WAP w/ Mounts
SKU: NSN-9402
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki MA-MNT-MR-4 Wall Mounting Plate for MR18 Wireless AP
SKU: NSB-5848
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MG21E-HW-NA CAT 6 LTE Gateway External Antennas Unclaimed
SKU: NSN-0081
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki MR78-HW Wi-Fi 6 802.11ax Internal Antenna Unclaimed Outdoor WAP
SKU: NSB-9659
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MV72X-HW Varifocal Outdoor Dome Camera w/ 512GB Storage
SKU: NSN-6126
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki MG21E-HW-NA CAT 6 LTE Cellular Gateway External Antennas Unclaimed
SKU: NSB-7453
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days