Electricity
Thailand uses 220 V AC, 50 Hz — almost identical to Europe (230 V / 50 Hz). Your devices will work without issues.
The sockets are inconsistent: You will find Type A (two flat pins, US style), Type B (three flat pins), Type C (Europlug), and Type O (three round pins, Thai standard). Most sockets accept both Euro and US plugs — an adapter is rarely needed, but a universal adapter won't hurt.
In older guesthouses and on the islands, sockets can be loose. A power strip and a power bank (at least 10,000 mAh) should be in your luggage.