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Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.
The new HMO1234ze used in Sonic Blast Horns is a specially formulated non-flammable propellant that has an ultra-low global warming potential (GWP). It has a 99.5% lower GWP than HFC-134a and is ideal for uses where flammability is a concern, including boating, manufacturing plants, construction sites, etc.
It is not considered HAZMAT, and needs no special documentation.
This 5 oz Sonic Blast horn provides up to 56 blasts per can.
• High impact white plastic trumpet
• Meets USCG requirements for boats to 65 ft (20 m)
• Provides a 120 dB sound level at 10 ft
We are a Seattle, WA based outdoor gear store with a mission to make climbing, backpacking, skiing & mountaineering accessible and enjoyable for everyone.
© 2026, Master Store
