Hamee (online store for smartphone accessories) released a faucet-shaped adapter for charging iPhone and smartphones called iTAP USB-AC Charging Adapter.
Once you turn the faucet on, iTAP USB-AC Charging Adapter starts feeding power to your iPhone or smartphone (blue light comes on). If you want to stop charging, you can just turn the faucet again. When powered-off, it keeps red light on. It's a power-saving product.