1.Bluetooth version:V2.1+EDR(A2DP) 2.Battery:3.7V/500MAH 3.Using for meeting,travelling,relaxing Portable Bluetooth Speaker Doss MINI DS- ... pressure cone technology,neodymium iron boron speaker,perfect quality sound. 5. Dual power,built in 3.7v 500mah lithium battery,external ... it can be used as power bank.6. SIG certified bluetooth V2.1+EDR7. Using for meeting,travelling,car kit,children teaching.