iNACU iNACU-221 NFC Enabled Easy Pairing Wireless Waterproof IPX5 Portable Bluetooth Speaker,18 Cores Hifi Aluminum Durable Uni-body, 8-12 Hrs. Hands-free Call with Noise Cancellation - Blue;

"Celebrate all the challenges we the human beings are facing!" --Memory edition for AlphaGo

Bluetooth low power consumption, stable connection, fast pairing and highly compatible to all kinds of devices with Bluetooth function;
Exquisite aluminium alloy cover;
Convenient controlling via the phone or the Bluetooth speaker;
Multiple input sources. With a 3.5mm Aux port;
Build in 1800mAh PLB, 8-12 hours nonstop happy time;
Automatic power off in 15 minutes without any operation.
Bluetooth version 4.0 Bluetooth profiles A2DP,AVRCP,HFP,SPP,BAS,DIS,FMP,HRP,HRS,HTP, HTS,IAS,LLS

Working distance about 33 feet
Loudspeaker ø45mm 4Ω / 5W x2
Frequency response 100HZ - 20KHZ
RMS 5W x 2CH
Sensitivity 80db
S/N ratio 60db
Distortion 0.4%@1W
Battery Built-in 1800mAH rechargeable lithium battery
Working voltage DC 5V
Charging voltage DC 5V
Charging current 400-500mA
Size L162*W62.6*H28.6 mm
Net Weight 250g

Note Previous / next track , Volume Up / down : short press is for previous/next track , long press is for increasing/decreasing volume.
For more details, please check the manual shipped within the package.