What is the maximum DPI of the included gaming mouse, and how many programmable buttons does it have?

The included wired M616 gaming mouse supports up to 10000 DPI and has 6 programmable buttons.

How many onboard macro keys does the keyboard have, and can they be used without extra software?

The keyboard has 4 onboard macro keys (G1 to G4), and they are programmable to work on the fly without any additional software.

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Redragon S141 Gaming Keyboard & Mouse Combo, 98 Keys K515 Wired RGB Membrane Keyboard and 10000 DPI Wired M616 Gaming Mouse Bundle

4 Onboard Macro Keys, No Software Required - Record and reassign G1-G4 on the fly for instant in-game combos or shortcuts, no drivers or installation needed to get started.
10,000 DPI, 6 Programmable Buttons - 5 redefinable DPI levels plus 2 side macro buttons let the mouse switch from precise aim to fast sweeps in an instant.
26 Anti-Ghosting Keys, Dedicated Media Controls - Press up to 26 keys simultaneously without input conflicts, and play, pause or skip tracks right from the keyboard.
Detachable Wrist Rest for Long Sessions - Magnetic wrist rest adds comfort during extended gaming or typing, and unclips whenever you want a smaller footprint.
Pro Software Controls Both Devices - Design custom lighting effects and macros for the keyboard alongside DPI and button assignments for the mouse, keeping your whole setup in sync.