Feature:<br /><br />It's HC-06 Bluetooth module<br />Allows your device to both send or receive the TTL data via Bluetooth technology without connecting a serial cable to your computer.<br /> <br />Specifications:<br />1.PCB Dimensions : 3.5cm  length  * 1.5cm  W <br />2. Weight :8gwith cable<br />3. Input voltage : 3.6V--6V， 7V ban over<br />4.Power anti-reverse， reverse module does not work<br />5. leads to 4 feet : VCC / GND / RXD / TXD<br /> <br />Package Contents:<br />1 X HC-06 bluetooth module with backboard<br />1 X Cable<br /> <br />Note:<br />Input power supply 3.3~6V， Prohibit more than 7V<br />No &amp;amp;quot;Automatically prevent power supply peversing func&amp;amp;quot;， so please correctly connect power supply<br />We advise to install &amp;amp;quot;Bluetooth master module&amp;amp;quot;<br />The &amp;amp;quot;State&amp;amp;quot; is output foot for LED status， when bluetooth &amp;amp;quot;Unconnected&amp;amp;quot;， output &amp;amp;quot;Pulse&amp;amp;quot; ; when bluetooth &amp;amp;quot;connected&amp;amp;quot;， output &amp;amp;quot;High level&amp;amp;quot;， we can determine the states&amp;amp;quot;MCU&amp;amp;quot;<br />If only the board ， No any &amp;amp;quot;Bluetooth Function &amp;amp;quot;