[Break the traditional impression] The silver color is fashion and nobel showing your attitude. [16 volume levels] Up to 16 levels are for adjusting the volume, which wakes up your world friendly. [Adaptation to the environment] There're 4 modes provided. The changing of environment is not a problem at all. [No need to charge every night] You only have to replace a battery once two months with the usage of 8 hours per day on average. [Long life span of 2 months] Model 220 is the most power-saved one in all Britzgo's products.