Bottle Cap Speaker / speaker

‘Bottle Cap Speaker’(B.C.S) is a cap, speaker and also lighting. People just need to connect MP3 with this bottle cap to listen to music. Using ear phone is one of the biggest factors of accident when people climb mountain and cycle on the road. However, this B.C.S could reduce that kind of accident. With B.C.S, Mountaineers just need to bring one bottle to drink water and listen to music, and the LED at the bottom of B.C.S converts the bottle into lighting at night. Moreover, this lighting works as a safety light for cyclist at night. The Solar panel on the top of B.C.S makes and saves energy to be used for LED when it disconnected with MP3.