... Light weight,High efficiency; 3.100% full-load burning test; switching power supply -----Manufacturer in Liushi for 8years, ISO 9001:2008 ... Short circuit / Over load LED indicator for powr on Fixed switching frequency at 37KHz Cooling by free air convection 1 year ... mVp-p100 mVp-p100 mVp-pDC Adjustment Range-5%,+10%±10%±10%±10%±10%Setup,Rise,Hold Time200ms,100ms,30ms at full load switching power supply