Easy to install. 100% Brand New. 100% original Walkera brand. High quality and durable in use. Light weight and protable to carry. Made of good and new technology material. Dimensions: 1.97 in x 1.97 in x 0.79 in (5.0 cm x 5.0 cm x 2.0 cm) Weight: 0.21 oz (6 g)