Crystal Duo is a vibrating trainer plus weighted ball set. Use manual vibration controls, or connect it to the Magic Motion App for app control and custom patterns.
Remote partner control: After the user with Crystal Duo connects it to their phone in the Magic Motion App, a partner in another city can control it remotely through the app. Both users need the Magic Motion App and a stable internet connection.
It is not a pressure-sensor feedback trainer. Compare the dedicated sensor-feedback Kegel trainers here.