The Sennheiser AVX MKE2 is a broadcast-quality radio mic and is one of the best in the business. It features the higher quality MKE2 omnidirectional lavalier (the ME2 lavalier is larger and much less high end), an ultra-compact receiver which plugs directly into the XLR port on your camera or field recorder/mixer, great battery life, and is very quick and easy to set up. Ideal for hands-free interviews and documentaries.
Each mic comes complete with a second battery for both the transmitter and receiver, and for your rental both of these spare batteries would be fully charged. The transmitters come in a custom foam-filled Duratech case, and each of them has a comfortable elastic body belt and pouch.
Download the manual in German or English. Other languages available here.
Weekly rental = pay for five days and keep for seven.
Daily rentals are also available for €40.
I have two complete AVX mic sets for rental which will cover most shooting situations. You can rent both mic sets for €70/day or €350/week. Pay for five days and keep for seven.