Lakeman Portable Bluetooth Speaker for Outdoor Bicycle Riding with LED Lamp CREE LED Light 350 Lumens for Night Riding 10-watt Speaker Handsfree Phone Speaker 5200mah Power Bank for Cellphones Built-in Bluetooth technology for answering calls and playing music from mobile phones or TF card during riding Solid aviation aluminium alloy material and IP4-level waterproof design. Built-in CREE Q5 LED lamp with high lumens. Built-in 5200mAh rechargeable battery ensures ultra-long working and can be used as a power bank for cellphones. Double 5W speakers delivers HiFi stereo sound effect. Built-in stereo FM radio for listening to local station.