The Rock 7 RockBlock FTDI Kit is a RockBlock 9603 bundle with FTDI cable. RockBLOCK takes its power from a standard 0.1" pitch direct header connector, or alternatively via an FTDI to USB adaptor (to power/control from a USB port). Both 213-1336 and 213-1335 have an SMA connector for an optional external antenna which is ideal if the product is buried. The internal antenna is ideal for most installations.