This small size Bluetooth 4.0 transceiver module allows your device communicate with IOS Android. It is easy to use and completely encapsulated. You can set it as slave or master. You can use AT command set the baud rate. Ultra-low standby power consumption 90uA-400uA, built in PCB antenna. Specifications:
Input Voltage: DC 3.3V/5V RX: Bluetooth module serial receiving port connect with MCU TXD TX: Bluetooth module serial transmitting port connect with MCU RXD GND: ground port power negative 3.3V: power port 3.3V power 5V: power port 5V power Size: 37 x 16 x 2mm