Livall slogan --- ride different livall, one of the leader of global smart sport accessories industries，focuses and leads on smart riding accessories research and building online community through phone application. Livall has gained numerous honors and approvals, since the establishment of the company in 2014, such as nominated on the general final list of ces ''last gadget standing '', debuted at ifa exhibition in berlin, 2016 eurobike, and more . Furthermore, livall has applied for 109 patents at home and abroad , 7 software copyrights and 15 international pct patents. smart turn signals: with 8 full-color led taillights and turn indicators and included 3 left-turn/right-turn signal lights for the safe riding. When you are going to make a turn, simply tap the bling jet controller installed on the handlebar. Even with the livall bike helmet - you should still make the appropriate hand signal when you're making a turn! Bluetooth speaker: the advanced bluetooth speaker make you enjoy the high quality music without the accessory tools on the cycling road. Meanwhile, make you call clearly and protect personal privacy without interrupting the cycling experience. And on the mountain terrain with complex environments, it can achieve walkie-talkie without limit of distance and language. specifications: tail lights : 8 full-color led taillights & turn indicators bluetooth distance :max. 10m if no blocks charging time : approx. 3hrs battery life : max. 3-6hrs for music and lighting duration : max.180days product size: m:305*225*150mm l:320*235*160mm product size : m:54-58cm l:58-62cm vents 21 note:this product comes with one year warranty.