DAI4531: Built-in DA14531 chip with excellent performance Small size and easier integration Low power mode for longer use, Support different power consumption modes, wake-up modes. Industrial grade and low cost: It is suitable for applications with large consumption short distance and need to reduce individual cost. Supports address binding between modules: Solve the directional connection function in the multi-slave environment up to 3 devices can be bound. Support serial wake-up, Suitable for low power application MCU fast wake-up. Host Mode - Sniffing: The host sniffing mode is used for device and positioning, and the serial port outputs the for addresses and RSSl values of peripheral devices in real time. Industrial grade components, Equipped with high-quality components. Color:As Shown Material:PCB Package Contents: 5 * Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.