You currently have the GUARDIAN 1.0 in use and think about new purchases next year? The i.safe MOBILE GmbH can advise you about your options.
For the zone 2/22 for example the CHALLENGER 2.0 is an alternative to the GUARDIAN 1.0. The CHALLENGER 2.0 is a very robust and water-protected industrial device. Easy handling and very long battery life provide best comfort. The LED flashlight is a useful feature in harsh environments. The device can be synchronized with Outlook and has two SIM card slots.