VCC: positive power supply
GND: power supply is negative
RXD: the receiver, Bluetooth module receives from another device sent data; normally connected to other devices transmitting end TXD
TXD: sending end, the Bluetooth module to send data to other devices; receiving terminal is normally connected to other devices RXD
EN: Enable, then you need to enter the AT mode 3.3V

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2.8 inch
Height : 0.2 inch
Length : 4 inch

Item Weight: 0 ounce (View shipping rates and policies)
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ASIN : B01JYNHSRG