BLE communication module based on the CC2541 IC.
Power supply - 3.6V-6Vdc
Logic level - 3.3V. For communication with Arduino boards use a simple resistor ladder level shifter on the RX pin.
Set up is via a serial comms program e.g.CoolTerm or the Arduino IDE and USB-TTL serial adaptor e.g. M029 using an AT command set.
Default configuration is slave mode, 9600 baud, NL&CR.
Can be set up as an iBeacon.
In master mode it can connect to a slave module within range.