This document is a user manual for the KYL-600L Wireless audio and data radio module. It provides specifications for the module, including operating voltage, carrier frequency, baud rates, temperature range, size, and transmission distance. It also describes features like double VCO structure, integrated RF techniques, and standard RS-232/RS-485/TTL interface. Application areas mentioned include industrial automation, environmental monitoring, automatic meter reading, security, and oil field uses.