Yeah, the new spring controller. I bought it from Gardiners. I have a Iphone 5s for work and I had to upload the latest download to be able use the phone for controlling the flow meter as it requires IOS 8 and above which wasn't mentioned on the website. Once the phone was updated to a newer operating system it was straight forward to link the phone and fob to the flow controller. The phone app which you download allows you to change the button functions on the fob to your own custom. One function I like is to be able to press a button on the fob to instantly increase or decrease the water flow by 10, very useful and convenient.
It says on the website that you can use it easily up to 100m around buildings. I have 150m of hose on my reel as I need it for some properties I clean and find that there are some blind spots where the radio signal gets blocked but overall it's very good for reception for receiving the radio signal. I only use my phone to control the water flow controller for turning it on and off, rest of the time I just use the fob which I hang around my neck for pausing or increasing/decreasing the flow. Takes a bit of getting use but I like it.