BW Technologies has introduced the new GasAlertMicro multi-gas detector, for H2S, O2, CO and combustibles (0%-100% LEL). The 6.5-oz. unit features: four-gas display, high-output alarms, internal vibrator, built-in boot and flexible power (alkaline/NiMH battery) for 16-20 hours of operation (four-hour recharge).BW Technologies, Calgary, Canada.