Feature: 1. 150+ Popular Courses: Aerobic fat burning, dynamic dance, muscle shaping, stress relief and relaxation, just pick up dumbbells in your hand and keep up with the coach's beat. 2. Dumbbell Has A Built In Sensor Module: Can accurately recognize each of your movements, and effective actions will correspond to perfect and good prompts, and the wrong or invalid actions will correspond to keep up encouragement prompts. 3. Accurate Calculation Of Daily Consumption: Regular training every day, combined with fitness goals to make weight loss no longer difficult, and witness the change of body shape after 4 weeks. 4. Silica Gel: Environmentally friendly and safe, elegant and smooth lines, smooth to the touch, does not hurt tender skin, reduces friction, and protects hands from calluses. 5. Same Training Time: Light weight will not cause damage to the joints, but also help you burn more calories. Specification: Item Type: Smart Exercise Dumbbell Materil: Silicone+ABS Dumbbell Weight: Approx. 1kg/2.2lb Built In Battery: Lithium Battery 180mAH Charging Time: 2 Hours Applicable Version: Applicable for ios9.0 or for android 4.4 and above. Package List: 1 x Exercise Dumbbell1 x Manual1 x USB Line