Review on Plantronics Electronic Switch APP 51 Control by Peter Joseph

Works as advertised. Bought for a colleague of mine's headset that didn't work with our new phone system. It actually worked, you just couldn't answer a call from the headset without pressing the headset button on the phone as the phone couldn't know you picked up the receiver. It was the missing part and it works perfectly. I've seen a few other reviews on connector spacing, but that wasn't an issue for us.