The Sonoff B1 is a white and color ambiance dimmable LED bulb with an E27 screw base. 

The dimming can be controlled via an iOS/Android App. With the App, users can select White, then the light will operate in white ambiance mode: and can set color temperature from cold to warm and change the brightness from 1%-100%. Select color, to change the color spectrum of the RGB bulb to a favourite atmosphere. There are four available scenes for the dimming LED bulb: rest, reading, party and casual. 

The Sonoff B1 E27 color LED bulb is compatible with Amazon Alexa(Amazon Echo, Echo Dot, Tap). Users can ask Alexa to dim or brighten, or adjust the colors of the led light bulb. 

Features: 

• Remote ON/OFF 
• White & Color light 
• Color temperature adjustment 
• Dimmable brightness 
• Changeable colours 
• Works with Amazon (Echo, Echo Dot, Amazon Tap) 
• Works with Google (Home, Google Nest) 
• Works with If This Then That (IFTTT)

Specifications: 

• Power Supply: 90V~250V AC (50/60Hz) 
• Lamp Base: E27 
• Rated Power: 6W 
• Typical Lumen Output: 600lm max. 
• Beam Angle: 120 Degree typical 
• Color Temperature: 2800K-6500K & RGB full color 
• Dimmable: Yes 
• Wireless Standard: WiFi 802.11b/g/n 
• Stand-by (Light off) power: 0.5W Max 
• Packaging Dimensions: 8580140 (mm)