Avantree Oasis is a long range Bluetooth transmitter & receiver with class 1 and antenna design. You shall get enough range if in normal use. Here we would like to share you some clients' feedback on Amazon about range.
… I use it with a Bose Bluetooth speaker. Range is greater than 50'. Maybe more, it reaches everywhere I've tried…- Scott on June 28, 2017.
…The range is incredible I can literally walk 150 feet away from this thing and not lose contact with it...--Gknee331on April 12, 2017.
… used it outside the other day while landscaping , very good. wont go out of range for at least 100 feet… --WARDon April 21, 2017.