RF-BM-4044B4 is a Bluetooth Low Energy v5.0 stack module. The smallest size makes it popular in the target markets of the battery-powered Internet of Things. Select RF-BM-4044B4 CC2640R2F serial interface module as your design option.
As one of the most popular modules, the RF-BM-S02 CC2540 Bluetooth LE4.2 module is designed for battery-powered based applications. The classic package size of RF-star enables this serial interface module to have a bigger market since 2010. RF-BM-S02 will be your good choice for design.