HC-08 4.0 Bluetooth serial port module Low energy consumption Current serial communication module for wireless mobile phone FEATURES This is a blue Bluetooth 4.0 module with 6-pin base board for Arduino, also suitable for your project Wireless DIY. The lead interface includes VCC, GND, txd, rxd, status, EN Only slave mode. Compatible with iPhone 4s / 5 / 5s 6 / 6s and Android phones 4.3 or later. Default rate: 9600, working voltage from 3.3V to 6V. and You can change the baud rate and the Bluetooth name using the at command.