This is the Spektrum A2020 Nanolite Servo.
The Spektrum A2020 is a digital high performance nanolite servo for slow flyer aircraft and is compatible with AR6300 and AR6310 series receivers that accept the JST ZHR connector. It also includes an adapter to Z-connector for standard receivers. Slow flyer aircraft flyers will want the Spektrum A2020 digital servo for its great control surface centering and the unmatched precision it provides for aggressive 3D flight.
One Spektrum A2020 Nanolite Servo