... of electronic components: ICs, Tantalum capacitors, Beads, Optical couplers, Relay, Fuse,Diodes, Discharge, Quartz crystal Devices, Speaker, Buzzer, Optoelectronics ... effectively demonstrate the quality problem is a must. 4. Please make sure to conduct a test on the parts before mounted ... items must be returned in their original condition to qualify for a refund or replacement. You please send us your ...