Dual-Lite approved, Battery Type=Nickel Cadmium, White, 4 “AA in Type cells, 600 mA, Output Voltage: 4.8 VDC, Operating Temperature: 0 to 45 °C, Terminal Type: 0.1 inch pitch, 2-pole, crimp type terminal. Only batteries approved by Dual-Lite are authorized for use with Dual-Lite products.