All three have good mosquito repellent effect, but from the health point of view, it is suggested that mosquito killer is better.
Mosquito killer is a simple and practical mechanical device, which lures mosquitoes by releasing light beam chemicals, and then uses negative pressure device to catch mosquitoes according to their living habits. It has the characteristics of simple structure, low price, beautiful appearance, small volume and low power consumption, and will not produce any chemical substances when working, so it will not pose a threat to human health.
Mosquito repellent liquid is a product with pyrethroid as the main chemical component, plus some kerosene and deodorizing solvent oil to achieve mosquito repellent effect. If the concentration of mosquito-repellent incense liquid is too high or too close to the human body, it will have a slight impact on health.