Add snow W04 intelligent security tail lights, high through high hardness of the shell, sensitive sense of shock, whole intelligence work, automatic induction, mini light, without installation tools, highlighting the LED lamp bead, 220 degree wide-angle warning, increase cycling safety, super long standby, IPX3 waterproof, fear wind and rain. W04 without switch. Fuselage with a light sensor and vibration sensor components, intelligent identification, day and night and whether cycling, thus automatic selection work state, without manual operation. W02 built-in three highlight LED lamp bead, found that more than 200 meters, effectively ensure the safety of the rider. W04 mounted with humanized design, riding friends 1 seconds without tools will tail lights finished loading. The IPX - level 3 waterproof design, seiko mould, make riding friends come rain or shine. Energy-saving design, super long standby for a year, W04 using intelligent energy-saving circuit design, according to two times a week cycling frequency about six months to a year in a battery.