Feature: 1. Different Course Options: 150+ Popular courses, you can choose from, dynamic dance, muscle shaping, stress relief and relaxation. 2. Simple Operation: Just pick up the dumbbells in your hand and keep up with the coach. It does not hurt the delicate skin, reduces friction, and protects the hands from calluses. 3. High Precision Induction: The dumbbell has a built in high precision induction module, which can accurately identify your every movement. 4. Accurate Recognition: Effective actions will correspond to perfect and good prompts at the same time, and wrong or invalid actions will correspond to the keep up encouragement style. 5. Effective Weight Loss: Accurate calculation of daily consumption, regular training every day, effective weight loss, and witness the body's change after 4 weeks. 6. Safe Silicone: Using silicone, more soft, environmentally safe, elegant and smooth lines, and feels fine and smooth. 7. Safe Training: The same training time, light weight will not cause damage to the joints, but also help you burn more calories. Specification: Item Type: Smart Dumbbell Material: ABS, silicone Weight: 0.75kg / 1.7 lb(approx.) Built in Battery: Lithium battery 180mAh Charging Time: 2 hours Applicable Version: Applicable to IOS 9.0 or for Android 4.4 and above. Package List: 1 x Smart Dumbbell1 x Manual1 x Usb Cable