Energy Efficient

Anyone coming in my home would have a hard time calling to be let in. Utility men, postmen and other delivery persons must hate dropping by my house for meter readings and delivery of bills, letters and packages. If any of my kids are commuting and has to use the front gate as entry, they need to text or call anyone inside the house so the gate could be opened. Yes. I do no have a doorbell. I have put one time and again but somehow, it always short-circuits. I guess the problem electrical line runs under the ground. There's no way that I would dig for that electrical wire as that would ruin my garden. I'll just have to rewire up ground. Meantime, my kids have been calling my little dog's name when they need someone to open the gate. Chip barks out loud when he (it?) hears his name called out. That's my cost-effective and energy-efficient doorbell.