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THE HMS1
As mentioned earlier the HMD2 can be connected to the HMS1 solar panel for use outdoors without having to recharge it every now and then.
This panel is bundled with a silicone cover for the HMD2 (increases its durability against sun and rain), wall mount with screws, rate card and the quick start guide.
The HMS1 is not only IP66 certified meaning waterproof and dustproof but it's also cold resistant.
By attaching the silicone cover on the HMD2 you ensure that it can endure even harsher outdoor conditions.