You have 4 lighting levels: 3 power and a flashing mode. At the rear, a green LED indicates that the lamp is connected to the battery. This one is charging in an electric breeze.
However, the power pays for itself in energy (3 hours max) and several hours to recharge.
The lamp is made of aluminum with a good finish. I'm not a fan of the attachment system (a big rubber) which is not practical when you have to remove the lamp. This is the case when you attach your bike to town.
The plug that plugs into the battery seems watertight, an important point, also in motion, sometimes in the rain. As against the small bag containing the battery (4 AA batteries welded) did not completely, at least I have a doubt. suddenly I placed it in a small black plastic.
Offered now at 32, it's really a good choice.