Xiang Cai

Chengdu NTS Technology Co., Ltd. provides radio frequency sub-systems. Its product lines range from power amplifier modules to communication subsystems. The firm's solutions cover high and low densities for outdoors, indoor supplementary and residential coverage, filters for medical instruments radio solutions, and internet of things including smart grid and communications. The company was founded by Rui Li in 2003 and is headquartered in Chengdu, China.

Guangzhou Knowledge Circle Network Technology Co., Ltd. is the private company behind the fun exercise (knowledge circle brand), which provides a professional online education counseling exercise punching tool. The company is based in Guangzhou, China. The tool helps teachers and institutions complete business scenarios such as admissions promotion, online lessons, counseling reviews, assignment correction, answer evaluation, etc. The Chinese company has more than 60,000 teachers and 10 million students. The company was founded in 2017, and the CEO is Da Wei Sun.