Wearable digital audio (Key Ring)
Standard product information
Amplifier
• Output power 2x4mW (16 Ohm)
•Frequency response 30-16000Hz
• THD 0.1%-1%
• Equalizer No
• Bass enhancer No
Audio
• MP3 playback 8-320 kbps and VBR
• WMA playback 5-192 kbps
• Sample rates (kHz) 8,11.025,16,22.050,32,
44.1,48
• ID3-tag support No
• Automatic power off Automatically switches 
off the key ring after 10 
sec in pause mode
•Track next/ previous Yes, plays the next or 
the previous track at 
the touch of a button
System
• Storage 64MB internal flash 
memory
• Removable Memory No
Card
• Display No
• Backlight No
Connections
• Stereo headphone
• Wired remote control
• USB1.1
Power supply
• Rechargeble battery Built-in 550 mAh NiMH
• 100% recharged battery 5 hours of charge time 
via USB provides 6.5 hours of
playback
• 80% recharged battery 2.5 hours of charge 
via USB time provides 4 hours
of playback
• External battery pack 10 more hours of 
playback (AAA alkaline 
battery)
Software
• Media management Music Match
• General data storage Directly accessible via 
Windows Explorer 
(Mass Storage Device 
Class compliant)
General
• Material Die-cast molded 
magnesium
•Product dimensions 3.4 L x 1.1 W x 0.5 H
(inch)
•Weight (oz) 1.2
• Chamshell dimension 7 L x 4 W x 1.2 H
(inch)
• Master carton 8.5 L x 8 W x 8 H
dimensions
• Master carton quantity 12
Accessories
• Neck strap 5-key remote control (AY3783)
• Hi-quality in-ear headphones
(SBC HE570/77W)
• External battery pack (AY3381)
• CD-ROM with software and full user manual
(AY3496)
• Quick-Start-Guide
• Safety & warranty booklet
PC system requirements
•Processor Pentium MMX 166MHZ 
or better 
• RAM memory 96RAM/ 50MB free hard 
disk space
• CD ROM drive
•OS Windows 98SE or later
• Mac G3 or better/ 
Mac OS 9-X
• Caution Computers that were 
upgraded from 
Windows 95,may not 
have USB compatibility
Direct USB plug-in to download music
Speedily and easily transfer your entire music 
collection from your PC to your Key Ring via direct 
USB connection. Effortlessly replace your playlists as 
often as you like!
64MB internal flash memory
Capacity to hold up to 1 hour of MP3 or up to 2 hours 
of WMA digital music.
Direct battery recharging via USB
Offers ultra convenience when recharging your Key Ring. 
No need to bother with separate chargers or cables, 
simply plug n’recharge your Key Ring directly on your PC.
Durable magnesium body
Made from ultra lightweight and sturdy magnesium 
for ultimate product protection – No unexpected dents 
and chips!
Neck-strap 5-key remote control
Highly intuitive soft fabric neck-strap remote control with 
flexible and easy-to-use control centre to take control of 
your music: Volume up,Volume down, Play/Pause, 
Previous Track and Next Track.
No software drivers required 
(except for Windows 98) 
Single UPC: 0 37849 93754 9 
Case UPC: 1 0037849 93754 6
Printed in Hong Kong 2003-03-20 
Specifications subject to modification 
without notice 
2003 © Koninklijke Philips Electronics N.V. 
All rights reserved
www.philips.com 
www.audio.philips.com
key004