NEC 920 - Manual (Page 34)

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TECHNICAL INFORMATION
Dimensions 147.32x50.8x27.94mm
(5.8"x2.0"x1.1")
Weight 7.8 ounces
Transmitting Power 0.6 W max. ERP
Operating Voltage 4.8V(int. battery)
Frequency Band 824.040 - 848.970 MHz (TX)
869.040 - 893.970 MHz (RX)
Standard Battery
Capacity
1000 mAh
Number of Channels 832
Memory Locations 24
Memory Capacity 32 digits memory locations 1-24
CARE AND MAINTENANCE
Your phone is a product of superior design and
craftsmanship and should be treated with care. The
suggestions below will help you enjoy this product for many
years.
Keep it dry. (Water contains minerals that will corrode
electronic circuits.) Avoid all liquid spills. Any form of liquid
will cause permanent damage to your phone.
Do not store in hot area. High temperatures can shorten the
life of electronic devices, damage batteries, and warp or melt
certain plastics.
Do not drop it. This might cause permanent damage. The
internal circuit boards can be broken.
Do not use or store in dusty, dirty areas. This will cause
permanent damage to moving parts.
Do not use harsh chemicals, cleaning solvents, or strong
detergents to clean it. Wipe it with a soft cloth slightly
dampened in a mild soap-and-water solution. If the unit is
not working properly, take it to your nearest authorized
dealer. The personnel there will assist you, and, if necessary,
arrange for service.