... .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 ... %±10%Setup,Rise,Hold Time200ms,100ms,30ms at full load switching power supply