... EDR(A2DP) 2.Battery:3.7V/500MAH 3.Using for meeting,travelling,relaxing Portable Bluetooth Speaker Doss ... 1+EDR(A2DP)2.Battery:3.7V/500MAH3.Using for meeting,travelling and so on Feature1. Special ... iron boron speaker,perfect quality sound. 5. Dual power,built in 3.7v 500mah lithium battery,external ... can be used as power bank.6. SIG certified bluetooth V2.1+EDR7. Using for meeting,travelling,car ...