Electop E27 Socket Adapter with On/Off Switch to US Plug, Flexible Extension Lamp Bulb Holder Converter Operating: As for this Plug Light Socket, you'd better keep the adapter parallel to the walls. Keep the on/off button downward towards the ground when you plug the light socket. Bent the swan neck outward. It is unsuitable for ceiling lights, because of gravity, it is unable to hold the bulb. Type: E27 Light Socket with On/Off Switch to US Plug. Neck Length: 9.5cm; Total Length: 22cm Safety: RoHS CE certificated. Fire Retardant PBT, 100% safe from electric flaming, Heat Resistant. Voltage: AC 100-240V 50-60Hz; Max Watt: 100W; Material: PBT&Metal