The Metro Mosquito Insect Refill 30Days is a liquid mosquito repellent refill bottle designed for use in an electric mosquito vaporizer/heater device.

Here are the key details about the product:

Product Type: Liquid Mosquito Repellent Refill (Vaporizer Refill).

Brand: etro (often listed as Metro Milan).

Claimed Duration: 30 Nights (or 30 Days/720 hours, assuming 8 hours of use per night).

Volume: Commonly available in sizes like 25ml, 30ml, or 45ml. The specific 30-day refill is often a 25ml or 30ml bottle.

Function: Provides continuous indoor protection against mosquitoes by slowly releasing insecticide vapor when heated by an electric device.

Usage: The bottle is screwed into a compatible electric mosquito repellent machine (vaporizer), which is then plugged into an electrical outlet.