Apple Earphones with Remote and Mic:. Volume control. Frequency response: 20Hz to 20, 000Hz. Impedance: 32 ohms. Audio:. Frequency response: 20Hz to 20, 000Hz. Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, and 4), Apple Lossless, AIFF, and WAV. Capacity:. 32GB flash drive. Holds up to 7, 000 songs in 128-Kbps AAC format. Holds up to 40, 000 iPod-viewable photos. Holds up to 40 hours of video. Battery and power:. Built-in rechargeable lithium-ion battery. Playback time:. Music playback time: Up to 30 hours when fully charged. Video playback time: Up to 6 hours when fully charged. Charging via USB to computer system or power adapter (sold separately). Fast-charge time: about 2 hours (charges up to 80% of battery capacity). Full-charge time: about 4 hours. Wireless:. Wi-Fi (802.11b/g). Nike + iPod support built in. Maps location-based service7. Bluetooth 2.1 + EDR. TV and video:.