USB Bluetooth 4.0 Receiver Adapter LED indicator Fast Response, No Delay 20m Max Range Connect 4 Devices SimultaneouslyVersion: 4.0 with EDR Chipset: CSR Apt-X certification Support 4 bluetooth devices at the same time Transmission distance without obstruction: 20M(Max) Transmission rate:3Mbps(Max) Frequency: 2.4GHz Apt-X certification Do not support APPLE Device Material: ABS Support Bluethooth Profiles:apt-X, A2DP V1.2, GAP, HFP V1.5, HID OVER CATT, AVRCP V1.4, HSP V1.2, SPP V1.2, DUN V1.1, OPP 2.2 WIN7/XP needs to download the driver and install it on the official website of UGREEN