JVC XA-A50CL - Manual (Page 31)

Specification
Design and specifications subject to change without notice.
Memory type: 128 MB Flash memory
Playable files: MP3, WMA, WMA-DRM (copyright-protected)
Headphones driver
unit:
30 mm diameter Neodymium
Power supply: AAA alkaline battery (DC 1.5 V) x 1
Battery life:
approx. 20 hours (Playback of MP3 files created at 64 kbps/22 kHz with LED setting
set to off.)
Cord length: 0.5 m (19-11/16 inch)
Mass: 57 g (2.01 oz) (incl. an alkaline battery)