Mosquito Killer Zapper Bat can be used outdoor and indoors. It comes with a patented technology that allows it to kill mosquitoes as it comes in contact with the wire mesh. It is rechargeable so you never run out of juice. Just hold the key and start your hunting! Do’s: Charge the mosquito bat 12 hours before use for the first time. Start using the mosquito bat by pressing and holding the red button located on the side of the handle. To avoid battery loss, press the red button only while using the bat.