The newest bluetooth v4.0 technology-lower consumption, connect your device in 3 seconds, outstanding connection range of up to 33 feets. 2×1.5inch total 7W powerful acoustic drivers play a full-range, abundant stereo audio, loud sound in such a small size. IPX4 typical shower outdoor speaker(splashproof,shockproof, dustproof&waterproof), rugged construction Built-in Li-Ion 1700 mAh rechargeable battery guarantees up to 12 hours playtime( recharge in just 3-4 hours with included micro USB cable) NFC technology(updated after July 10), Built-in Mp3 player automatically plays the music with a stand alone Micro SD/TF card. Built-in microphone for hands-free speaker phone calling Easy pairing. Specific remote shutter control function, have fun of taking selfie with this speaker.