Cy-Fi Wireless Sports Speaker for Bluetooth (Black) Cy-Fi Wireless Sports Speaker for Bluetooth; Black; A2DP Bluetooth Compatible. Use CyFi with your cell phone, PDA or MP3 Speaker Phone: Use CyFi as your speakerphone to take calls Voice Calling CyFi enables you to make hands-free calls (if your phone supports it) Remote Controlled- Change the track, volume and playlist settings from your speaker Mountable -Easily mount CyFi on your bike, boat, backpack, etc., with the provided hardware Battery Life- Over 5.5 hours; Wireless Range- 30 feet Lightweight- less than 4 ounces