I've seen SDRs that are roughly this size but they're the TV tuner ones that don't necessarily work well across a range of frequencies (not sure about specifics

I've seen SDRs that are roughly this size but they're the TV tuner ones that don't necessarily work well across a range of frequencies (not sure about specifics, but I imagine Bluetooth is pushing it). Some of the Flipper's advertised capabilities (infrared, NFC, RFID, 1-wire) are also beyond the scope of SDRs.