The Canon Speedlite 430EX is a compact, digital-compatible external electronic flash featuring a Guide Number of 141 ft / 43 m at ISO 100 (at the 105mm position).Key FeaturesAuto Zoom Head: Automatically covers a range from 24mm to 105mm and detects your camera's sensor size (full-frame or crop) to optimize light distribution.Wide Panel: A built-in pull-out panel widens coverage down to 14mm.Bounce and Swivel: Tilts upward 90 degrees, pans left up to 180 degrees, and pans right up to 90 degrees for soft bounce lighting.E-TTL / E-TTL II Compatibility: Works seamlessly with Canon EOS cameras for accurate, distance-linked automatic flash exposure.Wireless Slave Mode: Functions as an optical slave unit in a multi-flash wireless setup.Power Source: Operates on four AA-size batteries (Alkaline or Ni-MH)