kühlesBier yes it is bright enough. unfortunately the whole device didn't last very long.

BG561543802 I will try to answer that. to be complete, te Head is about 32,6mm in diameter. The handle (tube) is 24mm at its thickest point. the tail cap is 25mm in diameter. Hope that helps. greatings.

BG561543802 The device will work only in the night and charge at daytime. It has a light sensor and an IR sensor,so that it will light up only in the dark and when you are near it. When you install it, make sure that the sun can reach the solar panel. Also the device shouldn't be exposed to heavy rain.