VocoProTransmitters, USB, 4.00 x 4.00 x 8.00 (SilentPA-TX)

I've owned Lectrosonics IFB and currently own a bunch of Comtek PR-216 (option 7). Those cost a bunch more and are built more solidly, but for the price you really can't beat these VocoPros for IFB. If a producer or director drops one - which they always do - or leaves it somewhere - which happens often. It's only $70 to replace vs. $550 or $350. As to the reception it's clear and clean for about as far a range as the Comteks. I think these actually sound a bit better too as to fidelity. The battery life is less than the Comteks though but not by much which may be a difference between these using two AA's and the Comteks using a 9v. That in and of itself is a real plus. AA's are more common now days in TV production which is the work I do and what I'm using these VocoPro's for. I can keep a bunch of Power-x rechargeable or Pro-cell AA's around for the Lectrosonics SMQV's and use them for these VocoPro's as well. AA's cost less of course than 9v's and not carrying around multiple types of batteries is a plus.Another plus - it's much easier to change channels with the toggle switch next to the volume knob on top of the receivers or transmitter. The pots under a belt clip on the Comteks isn't nearly as easy. Pushing the knob down on a Lectrosonics R1a and having a producer or director complain that the IFB isn't working because the R1a went into scan mode is a pain.Bonus - buy a couple transmitters and field producers can change a channel to tune in what ever sound bag they want to listen to for different crews following different talent for reality TV shoots.One other advantage - use any standard 3.5mm TRS headset OR a TS mono headset. Either send sound to both earphones. The transmitters do NOT send two channels of audio. They are NOT stereo. They transmit a mono signal. The receivers output that mono signal to stereo headphones though.Build quality is plastic. They're $70 after all. If they get dropped on the concrete they probably will crack. I've not tried it and haven't had someone drop one for me yet... but it will happen I'm sure as they drop them all the time. The aluminum box for the Lectrosonics R1a is the most durable but then again drop and break six of these VocoPro's and it would cost the same as one Lectro receiver anyway.I'm a full time freelance location sound mixer based out of Austin, Texas. contactscott.com Nobody sent me anything to get this review. I originally bought just one transmitter and one receiver to test then found they worked so well I eventually purchased another transmitter and a bunch more receivers. They work well for IFB in my experience with them and I plan on buying more when these are dropped or lost by a producer or director.As to the 900mhz frequency - I use Lectro block 19, 21, 24, and 26. There hasn't been any inter-modulation caused from using these at the same time and having one of the transmitters in my Petrol bag with several SRb receivers and a Sound Devices 633. Everything plays nicely together. I've always powered the VocoPro transmitter off AA's and not the Remote Audio v4 BDS.It's not about the money - I could use Lectro UM400a and R1a's in my kit and have in the past. It's just that these work well (sound great with a good range), can easily change channels, and have good AA battery life. When they get dropped they are easy to replace. Good for TV (or feature film) production in my opinion and experience.