RF-BM-S02I is a CC2540 module with an IPEX connector designed for battery-powered and long range requirement applications. This module with small size may be the most suitable BLE part in your design.
RF-BM-S01A module is based on Texas Instruments CC2541 SoC. The higher and more stable performances enable the CC2541 module to enter a wide range of applications. RF-BM-S01A is one of the most classic Bluetooth LE4.2 modules.