Wholesale Refillable Design Multicolor Whiteboard Markers Custom Whiteboard Marker Pen Set for Students

  Product DescriptionrAJ-83X  Carbon Monoxide Detector ParametersCustomizable modulesWireless, Battery, Lcd, Voice, Color, Package etc.                 Wireless TypeIndependent & Wifi  & Zigbee & RF433 & 868mhz Operation voltage6V lithium battery (2pcs  3V battery)Battery lifeReplaceable 1-2years battery or 10 years Non-replaceable batteryStandby working current