C - 1 / ER3 [A, OHR]

On the left or above,
one ER3 batt. (1200 mAh) with internal and external antenna, weight is approx. 30g.
Internal and external antenna means that a part of the antenna is inside of the transmitter.  This applies to all of the following transmitters.

C - 1 / ER1733 [A, OHR]

On the left or above,
one ER1733 batt. (2200 mAh) with internal and external antenna, weight is approx. 35g.