12 V snail-style vehicle horn

An electrical horn listing with inconsistent descriptions of the supplied configuration.

Supplier figures: 12 V, 4 A and approximately 48 W.
Claimed sound level: 110 dB, without measurement conditions.
Frequencies listed as 510 ± 25 Hz and 410 ± 25 Hz.
Approximate dimensions: 12 × 8.7 × 6.5 cm; listed net weight: 210 g.
The title says dual tone, but the contents text lists one 410 Hz horn with a fixing screw. Other presentations mention a pair and different colours.

Confirm quantity, tone, colour, bracket, wiring, relay and fuse requirements before ordering. Universal 12 V compatibility, louder or clearer sound and road-use approval are not established. Have fitting assessed against the vehicle's requirements and applicable horn rules.