Features: Testing and electrical tuning testing require long period of time to provide PWM to brushless motors and other areas that require PWM. This product consists of a rotaries Switches and a dip Switches, which simulates the channel and dip Switches channel of a model airplanes remote. Both channel independent channel, with channel divided into high, medium, low, and gear positions. And there three different colored lights to indicate. Note that each channel of this device have two interfaces, which can simultaneously connect to four devices, This device can only be power. For example, when testing two circuit breakers, it is necessary to remove the UBEC of one of them, otherwise is prone to interferences. Specifications: Component:ABS Working voltages: 5-8.4V High and low frequency travel: 1000-2000us Size:Approx.6.5x6.50cm/2.56x2.56inch Package Includes: 1Pc Servo Tester note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.