The MLT-BT05 is a readily available, inexpensive Bluetooth 4.0 module based on the Texas Instruments CC2541 Bluetooth Low Energy (BLE) system-on-chip (SoC), sold by various Chinese suppliers and ...

The HM-10 offers only edge connections, so it usually comes mounted on a breakout board that extends requisite connections to breadboard-friendly male-header pins (which is how mine came from eBay).