HP X351 300W 100-240VAC to 12VDC Power Supply is an internal AC power supply for MSR3044/3064/4060/4080. at least one should be configured, Max. 2 for MSR3044 and MSR3064, Max.4 for MSR4060 and MSR4080.Warranty and support• Electronic and telephone support: limited electronic and business-hours telephone support is available from HP for the entire warranty period; to reach our support centers, refer to www.hp.com/networking/contact-support; for details on the duration of support provided with your product purchase, refer to www.hp.com/networking/warrantysummary