Unfortunately I had to send mine back as the trigger stopped responding. I've no idea what was up but the front LED wouldn't even come on with the test button. Another unfortunate problem with buying them from ebay was having to file a Paypal dispute to get my money back, the seller was all too happy to ignore me without a business premesis for me to turn up too. For those in the UK I would advise not buying them from gs12307 on eBay. Truely terrible service.
On the upside when they do work they are faultless. I was genuinely trying to make mine misfire without success.
Just ordered one TX and two RX... price is right, and free shipping to boot!
36 weak Brittish Pounds, less than a dinner downtown
Saw a pic from the inside, looks pretty well built!