... duration 5 seconds to 270 seconds, even more if requiredComponents PCB, IC, speaker, microphone, LED indicator, batteries, wire harness, switch, ... UNION injection machines, 6 sets mould making machines,3 sets high Frequency Plastic Welder,2 sets Ultrasonic Washing Machine, 2 sets Packing ... Machine. We have a high-educated R.D term which made up of 25 engineer ...