This MIFI 7730 router battery is a high-quality, long-lasting power source for your wireless router. It is designed for use with the Novatel WR-MF7730 router and comes with a 6-month manufacturer warranty. The battery is black in color and measures 2.9" in length, 1.7" in width, and 0.4" in height. This wireless router battery features a Lithium Ion Ultralast W, Battery, and 3.8V capacity, providing reliable and consistent power to your device. It is manufactured in China and complies with California Prop 65 regulations. This product contains Nickel Oxide and Nickel Hydroxide, which may cause cancer as listed under California Proposition 65. Purchase this item with confidence, knowing that it comes with a reliable and long-lasting battery.