Omaker M4 Portable Bluetooth 4.0 Speaker with 12 Hour Playtime for Outdoors or Shower Latest Bluetooth 4.0 Technology - Connect your device in 3 seconds;Outstanding connection range of up to 33 feet. Full,High-Def Sound - Enjoy an impressively crystal clear sound quality and robust bass realized through a 3W audio driver and passive subwoofer. Daylong Playtime, Fast Recharge - Enjoy 12 hours of music at 80% volume, up to three times longer than similar-sized portable speakers. Recharge in just 3 hours using the included Micro USB cable. IP Rated IP54 designed as a Outdoor Speaker and Shower Speaker - Unique Rugged Square Design with Splashproof&Shockproof&Dustproof& functions make it suitable for outdoors and shower. NFC technology - Tap-to-pair with NFC technology for easy and instant connection (If your bluetooth audio device has NFC function).