PRODUCT SPECIFICATIONS Size (D × W × H inches): 0.63 × 1.5 × 3.54 Weight (lbs): 0.055 Vibration Modes: 5 Vibration Strengths & 2 Rhythm Modes Running Time: Approx. 60min (Full Power) Charging Time: Approx. 60min (5V 1A) Waterproof up to 19.6in. USB Rechargeable Materials: Silicone, ABS, Li-ion Polymer Battery