Divoom Voombox Travel Ultra Portbale and Water Resistant Wireless Bluetooth 4.0 Speaker for Smartphones (Blue) Voombox-Travel uses Bluetooth 4.0 to wirelessly stream Hi-Fi audio anywhere you go from your smartphone or other device Rugged design, splash resistant, and built for the outdoors Enjoy 4 Watts of Audio output per channel with full-range listening experience Utilize the built in Waterproof microphone and enjoy hands free calls anywhere in your home, office, car, and even on your outdoor weekend adventure Rechargeable for up to 6 hours of wireless play