Rotor aluminum centrifugal casting is the way usually process with large sized rotors for motors. Centrifugal casting compare to die casting, centrifugal casting has more stable quality with conduct bars and end rings. And it also a more economic way compare to copper rotors, becasue the aluminum is much cheaper than copper. Rotor Core By Aluminum Centrifugal Casting,Laminated Rotor Core,Motor Rotor Core,Rotor Stator Core Henan Yongrong Power Co., Ltd , https://www.hnyongrongglobal.com
This bracelet uses a magnetic connector as a connecting ring. The connector has an indicator light that indicates the battery's power through different colors. The connector also has a USB port, which can be used to charge the smart bracelet.
This smart bracelet has a built-in Bluetooth module that can be connected to the smartphone via Bluetooth. Users can set the alarm time through the mobile app to let the smart bracelet wake up with gentle vibration. The current date and price of the bracelet has not been announced. 
Vibrating LED Smart Bracelet with Alarm Clock
Designer Yi-Hong Chou used LED and vibration modules to design a smart bracelet with an alarm clock. This smart bracelet is called VAM Alarm Bracelet. It consists of 24 beads. Each bead has built-in LED lights, which can be illuminated independently. 24 beads correspond to 24 hours a day. When the alarm is set, the alarm time corresponds. The LED lights in the beads will light up, and the blue lights have a good decorative effect.