16mm Shaft Diameter and 3000RPM, Durable Electric Motor Centrifugal Switch, Lightweight Centrifugal Switch, for Electric Motor Stitching Machinery sold2026 Pour Over Perfection: The narrow B00IIC6ALK Pour Over Perfection: The narrow opening on top is specially designed for Harios V60 size 03 coffee drippers Pairing Steps Press the earbud button 1 2 seconds to turn on it (indicator flashes red and blue alternately) Search name "J18" with your phone and connect (no flash after paired) Voice prompt – Earbud light status "Power On" : red and blue light blinking by turns turn on and ready to pair "Power Off“：red light blinks and off turn off If you can't connect this earpiece with your cell phones or other devices such as stitching machinery 16mm Shaft Diameter and 3000RPM