Good quality, ingenious fastening system of support: if you use batteries, a clipssage support on the lamp (screw fixing or double-sided tape, not included) for easy removal of the lamp without having to unscrew the support or tear , to change the batteries. Firewall against if you want to use an external power supply make sure it delivers 3.6v both continuously (3v it goes but the lighting is not optimal) beyond 3.6v you may grilled Led purely and simply! Why not put the external power 5V (with Ohm's Laws Act step-down, 2 small resistances enough!)
