Apesto Auto Edition, Ultrasonic animal / pest repeller. Compatible with cars & vehicle (12V & 24V) No Additional External Battery Needed. Under hood design. MOST ADVANCE TECHNOLOGY: Apesto Auto Adition car animal repeller uses a multiple combinations of advance technology to ensure that the best protection that goes into your vehicle. The main technology that is used to repel the rodents and animals is the ultrasonic transmitter that has 2 preset dB (sound) level settings to give you optimal protection. The tech Auto-Switching, allowing the frequency to constantly change so that the animals and pest don't get use to the same sound being produced. WHAT MAKES US DIFFERENT: Made with tough high heat resistant materials that can withstand the average heat that is produced by the engine without melting. It uses the battery from your vehicle to operate, compatible for 12V & 24V batteries which average cars and trucks use. The reason why we don't use conventional batteries is that they don't have as much heat resistance and in turn makes it dangerous when they reach a high temperature. EASY TO INSTALL: We understand that not everyone is technology savy, that is why we have designed the animal / pest repeller for your car that is easy and can be done within only a few minutes. PROTECTIONS: Multiple built in protection functions so you don't harm you, your car or the device. Low Voltage Protection, Positive and Negative Polarity Protection, 12V and 24V Compatible (will auto detect the voltage of the battery and adopt the needed voltage.) & Build material (The material is made with high temperature resistance and can withstand high and cold temperature.). BEST RESULTS WITH NO HARMFUL CHEMICALS: With our technology and our ultrasonic sound wave with all of its clever technology this is the best animal / pest repeller for your vehicle on the market. We focus to purely repelling and not killing, therefore no harm comes to the animals and rodents that it repels such as cats, rats, mice, squirrels and other small animals.