Check the listing for details. Spektrum A4040 MT/HS Micro MG HV Servo SPMSA4040 Servos. Condition: New. Listed at 49.99 USD. Features High Voltage (HV) capable (4.8-8.4v input range) Micro size is perfectly suited for parkflyer and sport size model aircraft Class leading performance (7.0kg-cm and .094 sec/60° @8.4v) Aluminum servo case helps keep operating temperatures low Low wear and tightly meshed all metal gear train Bearing supported drive train helps maximize smooth operation Over Current and Temperature protection Operating Frequency: 200hz to 333hz A4040 HV Mid Torque High Speed Digital Micro MG Servo The Spektrum™ A4040 digital micro, metal gear servo offers extraordinary performance for park flyer size (15-25 size) and specialty aircraft applications. High voltage capable, the A4040 can produce 7.0kg-cm (96 oz-in) of torque at 0.094 sec/60° speeds with 8.4V input. Its.