Semiconductor Disc Devices(Capsule Type) is the abbreviation of thyristor, also known as Silicon Controlled Rectifier, formerly referred to as thyristor; thyristor is PNPN four-layer semiconductor structure, it has three poles: anode, cathode and control pole; thyristor has silicon rectifier The characteristics of the parts can work under high voltage and high current conditions, and their working processes can be controlled and widely used in electronic circuits such as controlled rectifiers, AC voltage regulators, contactless electronic switches, inverters, and inverters. Semiconductor Disc Devices(Capsule Type) Semiconductor Disc Devices,Inverter Thyristor,Phase Control Thyristor,Capsule Type Semiconductor Disc Devices YANGZHOU POSITIONING TECH CO., LTD. , https://www.yzpst.com
When the bike speed reaches 10-40 miles, the MonkeyLight Pro system mounted on the bicycle wheel will light up the LED. Thanks to the well-known "visual persistence" effect, these flickering lights present an identifiable image in human vision, and we can also see the animation. 
A company in Northern California is taking bicycles to the next level, and by illuminating the wheels with LED lights, bicycle wheels can present custom images and animations. MonkeyLectric's Monkey Light Pro system on the bicycle wheel will display the LED when it is cycling. The Monkey Light Pro is a set of four-line waterproof LED strips. On web-based software you can program custom images and animations that can be sent to the optical system via Bluetooth.