Meet the OPUMP: a lung trainer that combines with your phone for games and guided workouts. It is compatible with iOS and Android devices, so you can use your phone to get live feedback and monitor your progress. The device also has LEDs to give you feedback without your phone.
The OPUMP breathing trainer can help reduce your stress and boost your athletic performance. It has an advanced MEMS sensor and an automatic air flow resistance design. It runs on a 400mAh battery.