1, Low ripple and noise. High reliabiliby 2, CE, CB, CEC,UL 3, 9V power adapter 4, Good quality, Competitive ... % (Non Condensing)Cooling: By natural airSafety and EMC:Certification: CE, CB, GS, CECDielectric Strength: Primary to Secondary 3000Vac, 5mA. 1 Minute ... Size: 5.5 x2.5x10mm (Inner positive), and Optional. UL CB CE certificated 9V power adapter