... design,the outer is negative pole,the middle is positive polevery effective to kill the insects.Weight: ... use the hand touching steel mesh, in order to avoid the electricity 2.frequently clean mosquito remnant on-line ... the tennis racket, do not let the child to plays, avoids shotting wrongly and frighten the child ... . don't contact the wire netting, forbid to use alongside the ignitable oil gas,the gas ...