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, great battery life, and is very quick and easy to set up. Ideal for hands-free interviews and documentaries.
I have two AVX mics for rental which will cover most shooting situations, but of course you can rent them on an individual basis.
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 if it is better and safer for the contributor. A manual is also included.
Cost is 40 Euros per day per mic or 70 Euros per day for both. Weekly rentals are available. Pay 5 days and keep for 7. See separate listings.