It is small enough to fit in the corner of your flight bag and only weighs 6 oz. It does not require any batteries. It is compatible with any cellular telephone that accepts a hands free system (i.e. has a 2.5mm jack on the phone).
Some phones do require an adapter to work properly. Check out the compatibility list to see if your phone requires one.
This unit works without batteries so you must have a VOX style intercom for it to work properly.
A VOX intercom is a Voice activated Intercom. One way to know if you have a voice activated intercom is to blow into your Mic and if you can hear yourself then you do in fact have a VOX intercom. If you do not have to key your Mic on to talk to the person next to you or transmit radio transmissions then you have a VOX intercom.
