Check this out. 

Don't be fooled by cheaper versions. The all-weather Brite Nite powerful bike light is not just a powerful 550 lumen safety device. The LED lights have three functions, high beam, low beam, and safety strobe. It's also a phone holder for easy navigation and boasts a long lasting 4000mAh battery to charge your phone as you go. The twin lights can be adjusted between 45 degrees, and the holder can be adjusted with the press of a button, this allows you to remove the gadget to take with you when you park your bike. It has a loud decibel horn and speaker, for playing music and answering calls. battery display, and is USB rechargeable, so you're not wasting your money on batteries. No tools are required to fit or remove the 4 in 1 device, and will stay firmly fixed, even after long bumpy rides.

Specifications:
• Color: Black, Blue, Red
• Material: ABS
• Size: Headlight- 7.5 X 1 x 4 X 6.5 cm, Adjustable Phone Holder- 6.4 X 13 cm, will accept phones 5.8 -8.6 cm wide.
• Weight: 300g
• Functions: Bicycle Headlights, horn/ speaker
• Usage Time: 4-8 hours
• Charging Time: 3-5 hours
• Battery Information: 4000mAh
• Light Mode: 3

Package Includes:
• 1 X Bike Light
• 1 X Bike Horn
• 1 X Fixed Bracket
• 1 X USB Cable
• 1 X User Manual