# Overall Introduction
This section describes the composition and functions of the device page of a single plant. Select Device in the Plant Details page to view all the core devices under the plant. Tap the device tab, to switch among different devices freely.

[Note] Devices in the red blank are only for reference, which should be subject to the actual situations.
Device composition varies with the system type:
- Aelio system: EMS, battery, hybrid inverter, supervision system, and air conditioning.
- Aelio-subordinated: Dongle pocket, battery, hybrid inverter。
- Trene system: EMS, battery, PCS, supervision system, air conditioning/liquid cooling.
- Trene-parallel: GRAND, FORTH PLUS, FORTH, and MEGA.
Besides, you can:
- tap a device tab, to view all equipment in the same type under the current plant.
- tap a device card to view its details.
- tap Maintain on a device card, to maintain a device remotely. The maintenance page varies with the device type, which should be subject to the actual situations.