Bluetooth have
Built-in Battery Yes
Model S20
Portable Speaker Features Hands-free call function | NFC Enabled | Volume control | Auxiliary input | Rechargable | Waterproof
Wireless
Water-resistant IPX6
Drop proof
Microphone
Output: 3W*2
Working Time: 8-10Hours
Supports MP3, WAV Audio Format
Built-in Lithium Battery, 2,000mAh