Item features: - Size: 65mm/125mm/145mm, unchargeable controller, receiver - This product requires a self-contained hull model and is intended for DIY modified remote control boat applications - Compatible with R130 high-speed, strong magnetic carbon brush motor used in model hulls - Recommended materials for model boat shell include foam, plastic bottles, or swimming kickboards - Receiver board supports three operating frequencies: 27MHz, 40MHz, 49MHz (specify preference at purchase; otherwise, frequency will be randomly assigned) - Remote control range varies based on assembly conditions; typical operational distance is approximately 35–50 meters with a speed of 15–20 km/h Scope of delivery: 1 SET KIT