At the end of primary leasing period, the lease provider sends a letter with two options.
1. Pay the secondary period rental of say €200 per month plus VAT
2. Discontinue further payments and become the legal owner of the asset (no payment required)
The secondary rental period is usually the equivalent of one month's rent of the first period - €200 per month seems high although obviously it depends on the original cost of the asset in question.
Personally I don't really see the benefits of continuing to rent the asset although there could be issues like if the assets breaks down then the lease company is obliged to repair it or replace with a similar model or other stuff like that - you'd have to read the T&C of the lease agreement