This letter recommends Mr. Zhi Li for a position. It details that Mr. Li worked for 8 months on a thesis project related to Zigbee wireless sensor networks under the supervision of the author. The project required an understanding of Zigbee hardware, network modeling, and software simulation skills. Mr. Li successfully completed the project, demonstrating a smart home application using a Zigbee wireless sensor network. The author fully supports Mr. Li's application and believes he will perform well in the position.