RECHARGEABLE LITHIUM BATTERY: Enjoy the convenience of cordless operation with our rechargeable lithium battery. A USB-C cable is included for easy charging, allowing for enhanced mobility and prolonged use without the need for constant power supply. HIGHLY SENSITIVE SENSOR: Features a Japan-made heat dioxide semiconductor sensor, renowned for its exceptional sensitivity and reliability in detecting gas leaks. HIGHER SENSITIVITY: Adjustable sensitivity with High/Low levels. BROAD RANGE DETECTION: Both SFD200&SFD201 are capable of identifying a wide array of halogen refrigerants, our detector efficiently pinpoints leaks in systems using refrigerants like: CFCs: R11 R12 R113 R114 R400 HFCs: R21 R22 R31 R121 R122 R123 R124 R141b R142b R221 R222 R401a R402a R402b R408a R409a R509a HCFCs: R23 R32 R41 R125 R134a R143a R404a R410a R407c R417a R507 R508a R508b R152a HFOs: R-1234yf R-1234ze R449a R452b R454a/b R455a R456a R457a R459a, etc. This versatility ensures comprehensive leak detection across diverse HVAC applications. In addtion to that, SFD201 can detect HC/Combustible Gas such as R50/Methane, R170/Ethane, R290/Propane, and R600a/Isobutane. LARGE COLOR LCD SCREEN: Equipped with a vibrant, large LCD display, our leak detector ensures you don't miss any leaks. The clear level display not only pinpoints the location of leaks but also offers a quiet working environment, enhancing user comfort and efficiency during detection tasks. SAFETY STANDARDS: Rigorously tested and conforms to the UL1484 safety standard for peace of mind and reliability. US-BASED CUSTOMER SERVICE: We provide responsive and dedicated customer service along with technical support, all based in the US. Our team is ready to assist you with any questions or needs you may have, ensuring a smooth experience with our products. WARNING: Prolonged exposure to certain refrigerants may cause health issues, including headaches, dizziness, and respiratory problems. Be sure to understand the specific properties of the refrigerant you are using and follow necessary safety measures to prevent hazardous situations.