Save power and make a generous array of adjustments with the EMX BPE-50 Safety Beam with Battery Powered Transmitter for gates and garage doors available at North Shore Commercial Door. The transmitter and receiver uses 12-24 VDC/AC, but it can also be powered by two 3.6 volt lithium batteries, which are included in your order — which ships free within one business day of being received by North Shore's expert customer service staff. Energy efficiency is taken into account, too, with the EMX BPE-50's power save option. You can adjust the transmitter up to 90 degrees to either the right or the left. The detection range is up to 50 feet, with a detection angle of plus or minus 5 percent. The included batteries have a life expectancy of two years.