M40 multi-gas monitor 1) small in size, light weight 2) durable 3) ... Product Name: Portable (CO,H2S,O2,LEL)M40 multi-gas monitor with pump M40 SPECIFICATIONS: Size: 4.30" x 2.45" x ... /hr. CHARGER SPECIFICATIONS: Runtimes:18 hours diffusion, 12 hours with pump Note: Any questions or problems, please feel free to contact ... me. Thanks. Portable (CO,H2S,O2,LEL) M40 multi-gas monitor with pump