A4 is a personal safety protection professional intelligent taillight, with intelligent wireless brake lights, intelligent light adjustment, intelligent start and stop, intelligent SOS distress lights, burglar alarm, three-color multi-mode taillights, USB lithium 2A fast charge and other fucntion, using the latest high-level ambient light detection and adjustment technology, programming, to solve people and vehicles in the process of riding the security risks, and do sophisticated design, user-friendly engineering design. burglar alarmIt uses hidden mounting design and USB charging mode, not only easy to operate, install and Lightweight appearance but also highly Portability , waterproof and weatherproof.

Features:
Applicable models: Normal installation is for biycle saddle bracket with distance 5~7cm(Any bike models and size)
Bicycle Tail Light & Anti-theft alarm in one device, convenient and compact to use
Big noise sound up to 120DB, clearly audible
Bright LED chip COB, high illumination, visible at distance
Built-in 700mAh 3.7V Li-polymer battery in lamp, USB rechargeable
Sturdy built, choice material & components, stable performance, durable in use.