1) Please note that upon receiving the racket, you shall charge it before first time usage. The lithium battery usually discharge itself yet may not have any power left due to time 2) Kindly keep the racket away from water since it is not waterproof, otherwise, you may cause a short circuit to the racket unit. Please wipe and clean the mesh-net only with a dry cloth 3) Please note that the racket is not a toy. Some residual electric current may occur naturally in the racket after usage therefore it should be used only by adults yet kept out of children reach