With this new design, 3 in 1 detector, that you can detect Carbon, Temperature, and Humidity at the same time. A digital Screen continuously displays the level of carbon monoxide present. Clear English Voice alarm, visible status indications LEDS (Power. Normal, Fault) and LCD digital display (Low battery, fault, and alarm, Carbon, Temperature, and Humidity). Button for test and mute: Test the alarm detect or electronics and mute the unit detect or during an alarm. Product Details Electrochemical carbon monoxide sensor LCD display, Voice alarm More accurate, reliable, and sensitive Electrochemical CO Sensor Colour: White Dimensions: 12.8 x 7.4 x 3.8 cm; 5.04 x 2.91 x 1.5 inch Weights: 210 G Power Source: 4 x AA battery (included, replaceable) Product Life: 10 Year Type of Sensor: CO-Electrochemical Detect: Carbon Monoxide, Temperature & Humidity Detection Standby Working Current: =85dB / 3m Executive Standard EN50291-1 KINDLY REMINDER: If delivery to the UK Highlands, Channel Islands, Northern Ireland, Isle Of Wight, Isle Of Man and the following postal code areas: BT, FK, KA (1-30), PA(1-49), PA(60-78),PA80, PH, PH(11-40), PH(41-44), PH(49-50), AB, IV, KW, ZE, GY(1-10), JE(1-5), PO(30-41), IM, IR, HS which are excluded from our standard delivery charge and may incur extra costs.