This document is a user manual for the JWSL-3 series economical temperature and humidity transmitter produced by Beijing Kunlun Coast Sensing Technology Co., Ltd. The transmitter features integrated sensing and transmission design, suitable for temperature and humidity measurement in HVAC indoor environments. The technical parameters include power supply, range, accuracy, and working environment. During installation, it is important to consider the installation position and avoid interference from high-power devices. When using the transmitter, it is necessary to connect the power supply and ensure correct wiring.