Wireless Transmitter and Bluetooth Headphones for iPod / Headset / Foldable / Up to 11 hours of music / Up to 100 hours of talking/waiting / Go wireless. Eliminate the frustration of tangled wires and let the Music play with the Sony Wireless Transmitter and Bluetooth Headphones for iPod. # Listen to your iPod with the joy of Bluetooth wireless technology with this convenient kit. You can even use the headphones for hands free talking when you receive a phone call on your compatible Mobile phone. Operate basic functions of iPod remotely from Bluetooth headset, which has AVRCP capability # Hands-free talking when you receive a phone call # Folding mechanism for easy portability # Unit Dimensions: 1.29 inch diameter, dome type (headphones); weight: headphones 0.17 pound, transmitter 0.01 pound # Communication: line of sight 30 feet (transmitter) # Battery: Up to 3 hours for charging of internal rechargeable battery connected directly to a USB port # Up to 11 hours of continuous music play back per full charge (headphones) # Up to 100 hours of continuous communication/waiting time per full charge (headphones) # Function: SBC (transmitter) # Type of use: open air, dynamic (headphones); modulation method - FHSS (transmitter) # Bluetooth technology: A2DP, AVRCP (transmitter) # Transmitter: 30 pin iPod connector # Headphones output: Bluetooth power class 2 # Transmitter output: Bluetooth power class 2 # Band: 2.4Ghz # Headphones frequency response: 14-24,000Hz # Transmitter range: 20-20,000Hz; A2DP; sampling frequency 44.1khz