****NOTE****In Size option、 the number 5 、 7 、 12 means wattage 5W 、 7W 、 12W 、 NOT quantity included. (Pack of 1 pcs)This is a very special and intelligent LED bulb、 when you use it daily、 the rechargeable battery inside will be charged、 when suddenly blackout、 the bulb will still work.- When there is electricity in your socket、 it is a normal LED bulb、 when blackout、 it will be a emergency bulb keep working.- Electrostatic induction switch、 the bulb will be automatically re-start after 1sec blackout、 you can also touch it to start like the picture show.- Electrostatic induction switch、 If you want to turn off emergency lighting、 you only need turn off the switch of your socket just like turn off a normal bulb、 .- The battery can support working about 3-5 hours. (brightness will decrease automatically to lengthen working hours.)Specification1. Input Voltage: AC 85-265V、 almost all voltage is OK.2. Base type: E27 (also apply to E26、 USA standard).3. Wattage: 5W、 7W、 12W (in Size option、 each number means different wattage).4. Light color: pure white 5500-6500K、 warm white 2700-3200K.5. Size(1 inch= 25.4mm): 105*60mm(5W)、 120*65mm(7W)、 145*95mm(12W).6. Package included: pack of 1 pcs.Remarks:1. How to test the function? turn off your master switch of your home、 then turn on the branch switch of socket、 the bulb will light up.