Bluetooth 2.0 SPP Module: With this Arduino BT-06 Bluetooth Board, You can quickly complete your small Bluetooth test. For example, you can make a Bluetooth LED, or a Bluetooth switch. Through this, you can better understand the Bluetooth technology. Working Voltage 3.6V to 6V , Default baud rate:9600,Default PIN:1234 Protective case: Come with a protective case, this transparent protective case can effectively prevent static interference from the hand and prevent accidental short circuit. Please note: this is a Classic Bluetooth 2.0 module that is not compatible with any iOS device (iPad or iPhone) Warranty: DSD TECH provides a one-year warranty for this BT-06 Bluetooth module. If you encounter any problems, please contact us and we will resolve your problem within 24 hours.