Feature 1、This sight is made of good quality plastic, sturdy, wearable and durable for years of use. 2、Powered by 2 * AAA battery(Not Included), the sight has long standby and working endurance. 3、Anti‑glare high definition acrylic lens gives good optical clarity, provides a wide field of view. 4、There is a aiming pattern on the lens to make shooting more accurate. 5、Easy to install and use. Features: This sight is made of good quality plastic, sturdy, wearable and durable for years of use. Powered by 2 * AAA battery(Not Included), the sight has long standby and working endurance. Anti-glare high definition acrylic lens gives good optical clarity, provides a wide field of view. There is a aiming pattern on the lens to make shooting more accurate. Easy to install and use. Suitable for water gun with 21-23mm rails. Specification: Material: Plastic Color: Black Battery: 2 x AAA battery(Not Included) Compatible: 21-23mm tactical guide rail Size: Approx. 13 x 4.5 x 6cm / 5.1 x 1.8 x 2.4inch Weight: Approx. 125g Package List: 1 x Toy Holographic Sight Package List 1 x Toy Holographic Sight