Come and see our amazing products! Bluetooth 4.1 technology, compatible with all Bluetooth-enabled devices. Powered by a built-in high capacity li-ion battery and lenrue's industry-leading power MANAGEMENT technology. Small size and lightweight. Dia 2.7" x 1.9" H. 1 set includes 1 speaker and 1 USB cable. Your custom logo and PMS colors can be imprinted. Pls confirm further with us if any query about packing info, inventory status and time schedule.