['[Smart Protection] -- The smoke tester features built-in overheat protection at 167°F and freeze protection at -4°F, ensuring reliable operation. After prolonged use, it enters a self-protection state to prevent overheating, at which point the indicator light will turn off, providing peace of mind during long testing sessions and ensuring the device maintains optimal performance', '[Smart Protection] -- The smoke tester features built-in overheat protection at 167°F and freeze protection at -4°F, ensuring reliable operation. After prolonged use, it enters a self-protection state to prevent overheating, at which point the indicator light will turn off, providing peace of mind during long testing sessions and ensuring the device maintains optimal performance', '[Smart Protection] -- The smoke tester features built-in overheat protection at 167°F and freeze protection at -4°F, ensuring reliable operation. After prolonged use, it enters a self-protection state to prevent overheating, at which point the indicator light will turn off, providing peace of mind during long testing sessions and ensuring the device maintains optimal performance', '[Smart Protection] -- The smoke tester features built-in overheat protection at 167°F and freeze protection at -4°F, ensuring reliable operation. After prolonged use, it enters a self-protection state to prevent overheating, at which point the indicator light will turn off, providing peace of mind during long testing sessions and ensuring the device maintains optimal performance', '[Smart Protection] -- The smoke tester features built-in overheat protection at 167°F and freeze protection at -4°F, ensuring reliable operation. After prolonged use, it enters a self-protection state to prevent overheating, at which point the indicator light will turn off, providing peace of mind during long testing sessions and ensuring the device maintains optimal performance']