Check the listing for details. PocketWizard AC7 RF Hard Shield Lightly used. Color: Black, Condition: Used. Listed at 30.40 USD. PocketWizard AC7 RF Hard Shield Lightly used Compatible with MiniTT1 or FlexTT5 range extendersBlocks RF interferenceCancels out noise travel through its connectionsEnhances operation range with select Canon flash units2 x 1/4-inch-20 mounts for vertical/horizontal installationMounts easily on light stands, clamps or bracketsOpening on the side allows for rotation of flash headsOffers outstanding even light distribution. Product Description:The PocketWizard AC7 RF Hard Shield helps to enhance flash unit performance when using the MiniTT1 or FlexTT5 range extenders. Particularly when using Canon's 580EX, 580EXII and 430EX flashes, where RF interference (EMI) tends to cloud up antennas, the material of the AC7's body effectively blocks it. Also built into the hot shoe of the AC7 shield is an electronic filter that cancels out noise travel through its connections. Using this shield with the FlexTT5 radio significantly extends the unit's range to receive transmissions by 300 to 500 percent. Versatile DesignThe AC7 is versatile and features two 1/4-20 mounting points for vertical or horizontal installation. Expand your setup possibilities and mount this shield easily on light stands, clamps or brackets. There's an opening on the side of the shield that allows the flash head to rotate when in use. Thanks to the lay-flat design of the AC7 shield, the flash will be situated towards the center when used with an umbrella, which results in outstanding even light distribution. PocketWizard AC7 RF Shield for FlexTT5Compatibility: MiniTT1 or FlexTT5 range extendersFlash units: Canon's 580EX, 580EXII and 430EX flashesMounting points: 2 x 1/4-20Color: BlackDimensions: 2.5 x 4.5 x 8.6 inchesWeight: 9.9 ounces