PROGBOX Six-in-One SkyRC Program Box is a very sophisticated electronic device that controlled by high performance microprocessor. With compact size and easy operation, SkyRC Program Box offers six-in-one functions: 1. ESC Setting 2. PC Interface - Link ESC to PC. 3. Input PPM Signal Monitor 4. Servo Tester 5. Motor KV/RPM Tester 6. LiPo Battery Monitor