The Bluetens Duo Sport is a wireless electrotherapy device for muscle recovery, strengthening, and pain relief. This system includes two separate units that can be individually or simultaneously controlled via a smartphone app, allowing treatments on two different body areas at the same time. Each unit weighs 25 grams and features a compact black plastic casing with dual functionality for Bluetooth and standalone operation. The device offers over 100 specialized programs for various muscle groups, including chest muscles, with electrode placement guidance based on anatomical references. Intensity can be adjusted either through the Bluetens app or directly on the devices. The system includes two main units, four cables with push-button connectors (two 15 cm and two 25 cm in length), two USB charging cables, two wireless adapters, and several electrode sets with four medium and eight small sport electrodes designed for optimal conductivity and diffusion effect. A protective storage bag is included for convenient transport. Powered by lithium-ion batteries, the devices require about one hour of charging for 4-5 hours of continuous operation. The accompanying app is compatible with smartphones and tablets with Bluetooth 4.0 or higher and supports Android 6+ and iOS 7+ operating systems. This medically certified electrotherapy system offers versatile muscle stimulation capabilities for athletic training and recovery purposes.