* Gold standard biofeedback technology & sensors * Designed for use with Elvie app * 5-minute workouts & 6 unique exercises * 4 levels: training, beginner, intermediate & advanced * Small, comfortable & discreet * Cover for custom sizing included * Waterproof * Smooth medical-grade silicone * Storage & charging case with micro USB cable Size Length: 3? (8 cm) Width: 1.4? (3.5 cm) Depth: 1.3? (3.3 cm)