Designed specifically for use with your e-bike's battery, the advanced taillight is the perfect companion for your riding experience. The rear light from Union connects to your bike's battery. No more fussing with extra batteries; just plug it in and you're ready to go. With a reliable and durable battery, your tail light will keep shining longer, no matter how far you travel. Specifications: Color: red Material: plastic Lighting type: led Power supply: via battery Type of bike: electric bike Voltage: 6-15V Bolt spacing: 50-80 mm Mounting: on luggage carrier