F means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. F WiZ 8718699787233Z, Smart bulb, Wi-Fi/Bluetooth, Amber, LED, E27, ST64 WiZ 8718699787233Z. Type: Smart bulb, Interface: Wi-Fi/Bluetooth, Product color: Amber. Energy efficiency class: F, Energy consumption per 1000 hours: 7 kWh, Input voltage: 220-240 V. Width: 2.52" (64 mm), Depth: 5.63" (143 mm), Height: 5.63" (143 mm). Package width: 3.35" (85 mm), Package depth: 3.35" (85 mm), Package height: 7.28" (185 mm). Quantity per pack: 1 pc(s)