What's the difference between leser radium and leser radium?

Cela Youlei and Cela brand series are different. Youlei is a new brand launched by Lesser in order to increase brand vitality and broaden the middle-priced market. It's Lesser's new series. Lai Sai Enterprise consists of Lai Sai Photoelectric Technology Co., Ltd., Lai Sai Laser Engineering Co., Ltd., Lai Sai Laser Tools Co., Ltd., Laser Technology Research Institute Co., Ltd., Lai Sai Precision Machinery Manufacturing Co., Ltd., Beijing Branch, Shanghai Branch, Guangzhou Branch and Chengdu Branch.