I realise this is probably stating the bleeding obvious, just letting others know that may not be aware of the consequences of not having a mechanical connection for locking. (Which I like by the way). My little story: Went wading at Bridgewater Beach with my key fob in my back pocket (mistake #1) and not carrying my mobile phone (mistake #2). I only had one back pocket in my shorts. Long story short - sea water ingress to the key fob, no longer working, couldn't use the phone ap to unlock the car. Stranded. Fortunately, with the use of the beach cafe phone, I was able to contact my daughter-in-law to pickup my spare key from my house and drive the 25km to rescue me. So, word of warning, make sure the key fob is kept waterproof or away from water. Have a plan B. And hope for a bit of luck. (Assistance not too far away and available. Have you any suggestions on any other safeguards? The fact I hadn't been in the sea for 30 years (the surf was up a bit) and a budding new romance probably clouded my thinking through the situation.