Shenzhen Kelvin Electronics Co., Ltd. is a Radio Frequency expert which was founded in 2006. We have an experienced and professional R&D team include hardware and software engineers, can finish entire development of new products from PCB layout and program writing to mass production.As a high-tech company, we have obtained over 40 patents in the past years, and some of them are initiative that lead the development of whole industry. Our products are divided into 3 series which are Standards-compliant (KelvinReg), Long-range(KelvinLoRa), and Paging system(KelvinRF).Series Standards-compliant (KelvinReg) comply to local standards, use original components and produced by advanced production technology. Series Long-range (KelvinLoRa) have higher-power transmitters and more-sensitive receivers. The longest distance reaches 31000m in real test. Series Paging system (KelvinRF) is widely used in many famous chain restaurants. We also have the fastest-rising model on eCommerce platform.