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The 21906 is used with our OBS-3A system. It allows a user-supplied lithium battery to power the OBS-3A instead of three D-cell alkaline batteries.
| Dimensions | 6.17 x 3.2 x 3.2 cm (2.43 x 1.26 x 1.26 in.) |
| Weight | 68.04 g (0.15 lb) |
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