Denon AH-GC20 Owner's Manual page 31

Contents Preparation
o General
Operating temperature range:
Power supply:
Weight:
z For purposes of improvement, specifications and design are subject to change without notice.
Connections Operation
5 ℃ - 40 ℃
DC 3.7 V (internal lithium polymer rechargeable battery)
275 g
31
Troubleshooting Appendix