The DL-RTC1101B-433M is a wireless module manufactured by DreamLNK. It is RoHS compliant and features a self-reception RTC core with 433MHz receiving and transmitting capability. It also has a built-in 400 mAh rechargeable NiMH battery and three different timer modes, including an hourly, daily, and weekly timer. The module is ideal for monitoring, controlling, and scheduling functions of electrical equipment. Additionally, it is equipped with various communication protocols, including I2C, SPI, and tricolor output channels.