for driver welded pcb board after assembling the ear-hook, the bottom shell and the driver, then seal it, so that the sound can not be leaked. use the ultrasonic wave to assembling the driver,which can be tightly combined with the sound cavity for no leakage phenomenon. clean the headset check the multi-function...
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water meter ultrasonic water meter is new revolutionary, precise and super reliable ultrasonic water meter, which is according to the iso- gbt standard, the water meter is adapted by advanced transit-time measurement technology, with the remarkable feature... previous next years focusing on flow meters...
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