... distance.3. Have energy-saving button: If you press I button on the switch, the brightness of the light ... 0.4W4. Have high illumination button: If you press II button on the switch, the brightness of the light ... charger to recharge, you can press I button on the switch and the lamp will not give out ... you press the II button on the switch; while if you press the I button on the switch, the lamp can ...