Uniwiay VK01 Multifunctional Portable Rechargeable Mini Flashlight Outdoor Sport Bicycle Wireless Bluetooth Speaker LED Bike Light Lamp Flashlight Torch-Black Stereo sound effect: This bluetooth speaker comes with the modern acoustic structure and double cores combined double speakers to upgrade total effect. Bluetooth hands-free phone calls: Built-in high sensitivity microphone with noise cancelling function to offer clear and fluent communication. Back-up power bank:With 2200mA lithium battery and USB port to serve as power source when necessary. Eco-friendly LED light:With energy saving LED bulb,this flashlight featured with longer working lifespan and 50m irradiation spectrum. Professional cycling equipment with FM transmitter:This bike light can be applied to various bike models with firm structure.