The HS-5645MG is the best overall digital servo when you also consider the price.  $55 for a 168 oz-in servo that was not digital would be a good deal but this servo is digital and is the best bang for the buck. Use this servo right out of the box and you will be amazed at how smooth and powerful it is. Take it a step further and purchase the hand held programmer and then the doors really open up as to what this servo can do. The combination of torque, speed, price and extreme holding power make it a favorite among top robot builders, pilots, and drivers. Special alloy gears called “Alumite” offer tremedous strength yet are lightweight as well.  We offer the HS-5645MG servo in several configurations, 90° stock rotation, 180° modified rotation, continuous rotation (potentiometer is left outside the servo case) and reverse rotation.

*Digital servos do not need to be programmed to operate. They work great right out of the box and purchasing a programmer is not neccessary.

This servo can be configured to operate 180° two ways. Option 1, send a pulse signal ranging from 600usec to 2400usec. Option 2, use a Hitec HFP-20 programmer to modify the internal servo program.