TUV test and EN 50291-1: 2018 standard,CE marking: WOLF SHIELD detectors are rigorously tested and are fully compliant with European and UK market guidelines, quality is 100% guaranteed,it is tested by the TUV testing organisation,conforming to the EN 50291-1: 2018 standard and it also has CE certified. 10 Years Sealed Battery Life and small: This Carbon Monoxide Alarms has a built-in 10 year battery life, battery operated and non-removable to avoid damage to the unit.this mini co detector size:1.06*1.06*0.31inch, weight:76.5g, which is easy to carry and travel,portable. Double bracket: WOLF SHIELD portable travelling carbon monoxide detectors contains 2 brackets, wall mounted and free standing, you can mount the detector on the wall or use the free standing bracket to place it freely on the desktop, both brackets are easy to carry and use. Dual alarms: flashing LED alarm and loud alarm sound.When the carbon monoxide concentration reaches the alarm value (approximately equal to 50ppm to start the alarm), the green, red and yellow LED indicators flash once in sequence, accompanied by four 82dB to 85dB beeps,such loud alarm sound can Wake you up easily even when you're asleep Intelligent LED Display: Our Monoxide Detector monitor will start displaying on the screen when the carbon monoxide concentration reaches 25ppm, so you can check the current co concentration at any time to maximise safety, and even low carbon monoxide concentrations of 25ppm-50ppm can be read on the screen., Weight: 0.16755131912 Pounds, Manufacturer: BROJEN