The HamiltonBuhl Replacement 12 V AC Power Adapter is specially designed to keep your 900 series transmitter functioning smoothly over many uses.Replace your old power adapter with the HamiltonBuhl Adapter. This adapter acts as a convenient and simple replacement for the W900 series transmitter. It runs over a AC power supply of 12 volts. Made from superior-quality material, it eliminates the need for frequent replacement.