COSO has a simple and intuitive design. It consists of a base with magnetic charging and a silicone container filled with water transmitting ultrasonic waves. Cleaning is also very easy. The proposed “testicle-bath” device needs to be filled up with water up to the indicated mark, which is set together with a doctor according to individual testicle size. The water is then automatically heated up to the temperature of a warm bath. The user then sits with his legs spread apart and puts his testicles in the water, which are ultra-sounded for two 15-minute treatments, two days apart. The remaining time can be monitored in real-time via the COSO app. After the treatment, the device switches off automatically. The app also notifies you of the need to use COSO. The whole system does not use hormones or any other invasive method of contraception. According to Weiss, the ultrasound contraceptive should become effective within two weeks and last for at least two months. And fertility would return to normal six months after the last treatment. The ultrasound contraceptive device offers a user-friendly contraceptive approach that is easy to use without any kind of physical intervention, pain, or previously known side effects.