266g!
this one claims to be under 100g
https://www.amazon.co.uk/Motorcycle-...xpY2s9dHJ1ZQ==
The cab buzzer will probably be 80-90dB and about 30g
"An audible warning must be loud enough to be heard by other road users.
For vehicles first used on or after 1 August 1973, the sound emitted must be continuous or uniform."