Model : 732 Battery:4V800mAH (nickel hydrogen Battary) Features: 1) Three layers of metal net, with two layers of safe metal net outside. 2) Requires 4V800mAH (nickle hydrogen Battery) 3) Once touch the middle electric net, the insect will be killed 4) The output power is relatively low constituting no hazard to human or pets 5) No smell is emitted by the swatter.