1.Rechargeable type:It furnishes 2 pcs of 1.2 V high quality rechargeable batteries which can by recharged in recycle for more than 600 times.It is quite practical and economic. 2.Twice-speed discharge:It adopts an innovative twice-speed discharge circuit which can output 2500V in a moment.So,it has the best result for hitting mosquito. 3.Electric shockproof Net:It can kill mosquito which is sucking blood on human bodies but it is harmless to human.when touching the net on flat surface,without any feeling of electric shock,so,it is safe for use. 4.Leakproof Net:It consists on a special 3-layer net which can easily catch insect and never leak out.