The MS53SF1-BlueNRG-355MC from Minewsemi is a RF Module with Frequency 2.4 GHz, Supply Voltage 1.7 to 5.5 V, Current Receiving 3.4 mA, Current Transmitting 4.3 mA (Emission), Output Power -20 to 8 dBm. More details for MS53SF1-BlueNRG-355MC can be seen below.