Water resistant loud speaker and built-in mic for both outdoor and indoor use. With colorful led light flashing, TF /Micro SD card & FM radio. Ability to answer/hang-up/redial/refuse calls with the push of a button With hook, convenient for outdoor sports Phone Speaker Product Features Model Number BTS-JM 40 Size 74*84*43 mm Materials ABS Color Red, black, blue, white, yellow,customized Battery rechargeable Li-Ion battery,support 4 hours play Certification CE, ROHS http://www.wirelessspeakerchina.com