Charge up an exciting campaign with the help of these C-bullet earbuds! With Bluetooth version 4.1, these earbuds have a wireless range of 32.8 feet and support music and talk time up to two hours. This makes an excellent gift for music-lovers or your next tradeshow giveaway. By adding your customized graphics or logo with our direct print method, you will be able to earn total brand recognition. Choose from select colors. Earphone battery is 40 mAh and the charging box battery is 200mAh. Bluetooth Profile: A2DP/HFP/HSP/AVRCP. Complete your convention with this great tool!