Remote alarm of ground car bicycle Remote control USB charging intelligent taillight bicycle accessories

About Product:Extra hours of super-long standby one month normal use for 15 days or so oh wait for another month. Without a remote control, do not bring photographic function, without the brake function (A4) without a remote control, Intelligent light-sensing after taillight open (with the function of brake lights) A6: remote control switch, function, with a trumpet with alarm function, with the function of taillillian