several of my hunting buddies purchased E-callers they are called wildlife technologies it has a remote control, ability to change sounds from aprox 200yrds & you can have multiple sounds downloaded to the callers sound board it has a large white external bell type speaker but isnt overly cumbersome to pack, the wolf howls are ( EXCELLENT ) i havent had much experience with them but the limited use & experience i do have with them i can say i was impressed greatly. its late so i cant call & get more info from them such as price, pros & cons but i hope this is of some assistance to you, there are several good quality E-callers on the market so research them all & choose what best suits your needs, doesnt hurt to carry a few good quality mouth calls incase of e-caller failure.
Let me start off by saying I am not a farmer.
I am a deer hunter and I do own a tractor and have all of the equipment - but that does not make you a farmer any more than standing in the garage makes you a car - well, you get the picture!
Having said that - and with most of my ineptitude fairly well hidden - I do think that buckwheat is one of the most under rated cover crops out there.
I say cover crop because I see mixed results as it relates to the deer eating the plants.