Wireless Fire Alarm Smoke Detector with 90dB Sound 3.6V Lithium Battery

Wireless Smoke And Fire Detectors For Fire Alarm With LED Indication   Elegant appearanceStable in function and dependableAdopts low-power microchip and software calculationParticular self-check functionLow voltage check and remindAlarm protocol:EV1527/PT2262/OEMAlarm frequency 315/433MHz for optionAnti RFI/EMI interferenceAdopt advanced SMT technologyFit for:house, cafe,KTV, hotel, restaurant, apartment etcCan get detection range of  40 m²when installed at the height of 2.3-6mCan get detection range of  60 m²when installed at the height of 6-12m SOUND ALERT INSIDE STRUCTURE POWER:LITHIUM BATTERY BACK VIEW Power input: 3.6V  1/2AA lithium battery Current: