Casella CEL CEL-281 - Manual (Page 135)

Digital output:
CEL low-power Interface, 4800 baud.
Dimensions:
Overall dosimeter plus keypad:
150 x 83 x 41 mm, 310 g complete with batteries and battery
holder.
Dosimeter only:
138 x 79 x 41 mm, 270 g with batteries and battery holder.
Batteries:
Main batteries:
4 x IEC AAA (LR03) manganese alkaline type.
Battery life is typically better than 16 hours.
Memory & clock back-up battery:
Battery life is typically considerably better than 2 years.
(This battery is not a user replaceable item.)
Page 126 - CEL-281 Operator's Handbook
Technical Information_