Check the listing for details. REEF's 55 MICRO Sub Micro SERVO digital core trx-4 trx-4m programmable reefs171. Condition: New. Listed at 59.95 USD. Reef's RC 55MICRO Sub Micro Servo BRAND NEW FACTORY PACKAGEDFULL MANUFACTURERS WARRANTYWith up to 55oz of torque and .08s response time, this digital sub-micro servo is small and mighty. The 55Micro is a Direct-fit upgrade for the TRAXXAS® TRX-4™ and TRAXXAS® TRX-4M™ and offers greater performance and reliability anywhere a TRAXXAS® 2065 sub-micro servo might be utilized. Offering a digital core with pulse width modulation control, so your servo will operate in a highly efficient and consistent cycle. If being waterproof and Fully programmable isn't enough, now you can run higher voltage (up to 8.4v), so in most cases there is no need to bypass this tiny servo in your system.FITS:Direct-Fit Replacement Upgrade for TRAXXAS® TRX-4™ TRAXXAS® TRX-4M or #2065 servoAny Sub-Micro application that demands high performance and reliabilityUtilizes Standard 25T servo horn such as Reefs 25t horns 55Micro Servo, ProgrammableFeatures:Fully Programmable Digital ServoPulse Width Modulation ControlCNC Aluminum CasingMetal Internal GearsBEC Not RequiredTechnical Specs:Travel: 180Angle: No limitVoltage 4.8 - 8.4Temp Rate: -15C~ +70CWeight: .67oz / 19gDimension: (LWH) .90 x .50 x .86 in (22.9 x 12.8 x 22 mm)Torque: 41oz @ 6.0v; 48oz @ 7.4v; 55oz @ 8.4vSpeed: .11sec @ 6.0v; .09sec @ 7.4v; .08sec @ 8.4vSpline: 25T Standard