In addition to regulating the generator voltage,the AVR circuitry includes under-speed and sensing loss protection features.Excitation is derived directly from the generator termainals.Positive voltage build up from residual levels is ensured by the use of effcient semiconductorsin the circuitry of the AVR.Provision is made for the connection of a remote voltage trimmer,allowing the user fine control of the generator outputColour:Photo ColorMaterial:plasticPackage Contents:1 x Automatic Voltage RegulatorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.