QClick QRF300 Classroom Response System w/ 12 Stud Teacher Remote: LED indicator for power statusPower: 2x AAA batteries Student Remote: LED indicator for power statusPower: 2x AAA batteries Receiver: Technology: 2.4 GHz RFMaximum units/receiver: 1,000Connection: USB Includes: 12 student remotes, 1 instructor remote, 1 USB receiver, QClick software and 1 carrying ca Compatibility: Windows XP/Vista/7/8 (Mac software available upon request)