1) 4 in 1 USB card reader 2) For SD/SDHC/DV/T-Flash ... ,Support USB 1.1 Version Specification High transmission Speed,May Reach To 480 Mbps Support SDHC, miniSDHC (SD 2.0) Bluetooth Version 2 ... ,Built-in Antenna Specifications Specifications Type: USB 2.0,Support:Bluetooth V2.0,Working Frequency:2.4G -Working Distance: 30M, Transmission Speed ... OS×10.1or later Version: USB 2.0 4 in 1 Multi USB card reader