Denso Car Horn E13 (0026): DENSO OEM ELECTRIC HORN POWER TONE 272000-2650 ND-012 0026, FLAT SHAPED.  OEM Quality Replacement Part. Single Plug/Pin. Compact and slim, easy to install. Good waterproof performance. Uses a vibrator to amplify sound according to its resonance. Possesses a sharp and stimulating timbre that is very effective for warnings. They have a sharp frequency characteristic and highly efficient amplification, making them the most compact type of horn.