Sony maybe pulling out of the tablet and smartphone business in the future but they are still releasing a limited number of devices. This includes the previously posted about Xperia Z4 Tablet and now the Sony Xperia M4 Aqua.
The Xperia M4 Aqua is a mid-range version of last years excellent Z3 compact which is a fully waterpfroof 5-inch Android Lollipop device.
Unless you are a big gamer the internals should be adequate for you with a Snapdragon 615 processor, LTE, 2GB of RAM, and up to two days of battery life from a 2,400mAh cell. Hopefully the M4 will match the industry leading battery performance of the Z3 compact. The battery is smaller but the CPU is also less powerful so it should balance out. Talktime is claimed to be 13.28 hours verses the Z3c 12.00 hours, but from personal experience this often means nothing.
Sony have cut costs using a plastic body instead of metal, but they have improved the waterproofing so you no longer need a cap on the USB port.
Beyond the SoC, the phone has a 13MP rear-facing camera with an F/2.0 aperture, and a 5MP front-facing camera.
Pricing is set at 299 euros which means it could be a great mid-range option for most people.