Revesun Black BT300 ADIN 36W Blutooth CSR 4.0 3200mAh Big Power Vibration Speaker for PC,Tablet,Mobile Phone. PVC plastic + Aluminum Alloy material; Bluetooth, CSR 4.0; NFC, easier Bluetooth connection; Built-in microphone, for hands-free phone call; Built-in microphone, for hands-free phone call;