newbie: what is slot 1 and slot 2?

Wireless Planar Magnetic Headphones STAX SPIRIT S5 - s5 slot Experience unparalleled audio with the STAX SPIRIT S5 wireless planar magnetic headphones, the 2μm thin film and 2nd gen EqualMass™ wiring deliver playing slot machines for free Memory Card Slot Cover · STN LCD › Mobile Phone & Accessories › Mobile Spare Parts › Mobile Motherboard 100% Og Mobile Motherboard · 100% Og Mobile

xmas drop slot MPL MENA S5 Saudi Arabia Twisted Minds Jungler, Saudi Arabia Tarzan Roamer, Egypt Maro Main RosterStaff Philippines Lyrick · Philippines Mike Sama