A few facilities even use biometric thumbprint or hand scanners to ensure that access is granted only to those that rent. Self-storage facility operators frequently provide 24-hour access, climate controlled storage, outdoor storage for RVs and boats, and lights or power outlets inside the storage unit as amenities to set themselves apart from competitors. Some storage facilities have open roofs i.e. a wire mesh roof which are not that secure, compared to ones that have full covered tin roofs that provide added security and privacy.