Ventilation door latching alarm device

chinacoal07Ventilation door latching alarm deviceProduct is flameproof and intrinsically safe design, the use of advanced microcontroller master controller performance, and with high fidelity language generation chip. By the high-sensitivity sensor proximity switch detects throttle.Open the throttle, the alarm device will issue voice prompts, while flashing red warning signal to alert the bearer attention to safety. Small size, light weight, innovative design, advanced