This is an amplifier for a brushless motor. 2-4 cell Full auto I purchased this about 20 years ago. There was an Enroute shop in Akihabara, and I bought it there along with a small CUB aircraft. I've only used it a few times. However, it's been a while, so please refrain from purchasing if you are concerned. Operation has been confirmed. The item is as shown in the photos. There is no Japanese instruction manual, so I have prepared one by searching the web. (I apologize that it's in English) ★I will provide as much information as I know, so thank you for your understanding. The en ESC-25A is in soft start mode. It has no brake response when operating and starts slowly and steadily. Suitable for gliders or sudden cutoffs in aircraft. When the battery drops below 65%, the system cuts off the motor output and activates the glider. ★ESC Specifications: 25A B4515H Brushless ESC - Air INPUT 6V-14.8V OUTPUT 25A/7.2V (MAX180W) BEC DATA 5V 2A PEAK/CONTINUOUS 38/28A P.W.M 9.5KHZ WEIGHT 23.6g DIMENSION 38mmX24mmX6mm (L B H) Full Auto Please consider purchasing if you understand all of the above. #NOVATECH #BrushlessMotorAmplifier #FullAuto