Model: GB-92B Combustible Gas Detector Features: Small and light, convenient to take, with digital display. Sound and light warning adopts Lithium battery that requires no charge up. Therefore the power supply lasts longer. The design of double-key-to-shut avoids turning-off by accident and sets your heart free to use. The detector turns into using state promptly after start. No time needed for polarization. The sensor and battery are convenient to be changed for new. We adopts imported advanced electrochemistry sensor with 3 electrodes to ensure stability and long life of the detector.