Vectronics DL2500 Series is fan cooled and handles short term (up to one minute max.) RF power up to 2500 watts at frequencies from DC to 150 MHz. Duty cycle is 50% at maximum power. Vectronics DL2500 Series handles 500 Watts continuously with fan running. Uses dispersed carbon particle ceramic matrix resistors. Vectronics DL2500 Series VSWR is less than 1.3:1 at 150 MHz. Dimensions are: 8.5" (W) x 9.25" (D) x 4" (H). 12 volt DC power adapter is included. The Vectronics DL2500 Series is available with an SO-239 connector or "N" type connector.