Sony Walkman NWZ-S544 Operation Manual page 128

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Additional Information
Output (headphones)
Frequency response
20 to 20,000 Hz (when playing data file, single signal measurement)
FM radio
FM Frequency range
87.5 to 108.0 MHz
The frequency is changed by 0.1 MHz.
IF (FM)
Not applicable
Interface
Headphone: Stereo mini-jack
WM-PORT (multiple connecting terminal): 22 pins
Version: 1.1
Hi-Speed USB (USB 2.0 compliant)
Operating temperature
5 °C to 35 °C (41 ºF to 95 ºF)
Power source
 Built-in rechargeable lithium-ion battery
 USB power (from a computer via the supplied USB cable)
Charging time
USB-based charging
Approx. 2.5 hours (full charge), Approx.1 hour (approx. 80 %)
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