?An optical tachometer is a must-have tool for model airplane player. It is helpful to ensure your model airplane to fly stably in right route. This SKYRC SK-500010-01 OPT-010 Plastic Optical Tachometer is made of superb plastic material・ very lightweight and durable. With LCD display・ it is convenient to make you read scales easily. Besides・ powered by CR2032 button battery・ it is energy-saving and cost-effective. With 700-4500RPM range・ it is practical and helpful to run. With this optical tachometer・ you can control your model airplane easily. What are you waiting for?                                    Features             Plastic material is lightweight and durable<br> With LCD display to get scale easily<br> It works by CR2032 button battery<br> With 700-4500RPM range・ it is practical to use<br> Easy to install and dismantle<br> A must-have accessory for model airplane player<br>                                                            Specifications             Dimensions     (4.13 x 1.97 x 0.47)" / (10.5 x 5.0 x 1.2) cm (L x W x H)    <br> Weight     2.89 oz / 82 g     <br> Color     Red・ Black    <br> Cover Material     Plastic    <br> Power Supply     CR2032 Button Battery    <br> RPM Range     700-4500RPM     <br>                                                             Package Includes            1 x Optical Tachometer<br>