Features:1) Detect carbon monoxide 2) Motorola IC control, reliable function without false alarming3) Field audio and visible alarming4) 9V battery power supply5) 85dB horn 6) Response time: 30s7) Alarming level: 150ppm CO8) Self test function 9) Simple installation10) Excellent reliability and high stability 11) Durable sensor head 12) High accuracy producing area:China payment:T/T, L/C supplying capacity:100,000pcs/month