Review on zdyCGTime DC2.5x0.7mm Male to DC5.5x2.1mm Female Adapter - 90 Degree Angle, 5V Charging Cable Connector for Tablet, Electronic Dog, Access Control - 2 Pack by Bobby Montoya

Seems well made and works well in my application. Check the plug and socket sizes to make sure they match your plug size requirements. It's great when using a rectangular adapter can reduce stress on the power cord - bending the wire coming out of the plug puts enough stress on both the conductors in the cord and the plastic insulation, which can fail prematurely over time. The plastic insulation of electric cables is particularly prone to "drying out" [especially small cables] and cracking, shorting out bare conductors and leading to poor equipment results.