PocketWizard 801-130 Plus III Transceiver (2-Pack with Case) Combination Transmitter and Receiver / Frequency: 340-354 MHz (FCC/IC) Long Range of 1640 Feet / 32 Channels and Quad-Zone Triggering Auto-Sensing and Auto-Relay / Up to 14.5 fps Shooting Side-View Design and LCD Monitor / Full Compatibility with Previous Models Each PocketWizard is powered by only Two (2) AA batteries