The Core module is HC-05 bluetooth 2.0 serial module. By using this HC 05 Bluetooth module , you can quickly add Bluetooth features to your wireless DIY Project. The factory setting is slave mode, but you can set this module to master mode so that you might be able to connect to other Bluetooth 2.0 devices. Please note: This is a classic Bluetooth 2.0 module , it is not compatible with iphone or ipad. If you need to use iphone or ipad to control your DIY project. You may need a Bluetooth 4.0 BLE module (such as SH-HC-08 Bluetooth 4.0 ble module) How to enter the AT command mode Way 1: Step 1: Input low level to PIN34->EN PIN. (it can also be floating) Step 2: Supply power to the module. Step 3: Input high level to the EN PIN(PIN34)(you can press the button this do this action,if you buy HC-05 from DSD TECH) Then the module will enter to AT mode. The baud rate is as same as the communication time, default is 9600 Way 2: Step 1: Connect PIN34(EN PIN) to the power supply PIN.or always press the button . Step 2: Supply power to module Then the module will enter to AT module. But at this time, the baudrate is always 38400. In this way, user should change the baud rate at the AT mode, if they forget the communication baud rate. Package List: 1* HC-05 Module with 6PIN 1* 6PIN Dupont Cable About WARRANTY: DSD TECH back this module with ONE YEAR WARRANTY. If you meet any question, please contact us, we will fix your issue within 24 hours. See more

Why choose DSD TECH brand: you not only get high-quality products, you can also get technical support and ONE YEAR WARRANTY. You can ask any questions about this HC05 module, our technical team is waiting for you. 6 PIN Dupont Cable : with this Dupont Cable, you can easily connect this HC-05 Bluetooth module. Button: Press the button, the module enter the AT mode. AT commands are executed only in AT mode. Master and Slave 2-IN-1 HC 05 Module:Working Voltage 3.6V to 6V , Default baud rate:9600,Default pin:1234. HC-05 Wireless BT Module: with this HC 05 Bluetooth module,You can quickly add the Bluetooth feature to your DIY project, and then you can use your android phone to control some gadgets, such as: switch, LED.