Can answer my own question! Apparently it is one voucher for one transaction.

Thanks

“Customers that redeem a CR200, PLAY:5 GEN1 product or certain CONNECT (including ZP80 and ZP90) or CONNECT:AMP (including ZP100 and ZP120) models will receive a Discount Credit equal to 30% off any one (1) regular priced product on sonos.com, with some product restrictions indicated below. Customers that redeem a PLAY:1, PLAY:3, PLAY:5 GEN2, PLAYBAR, PLAYBASE product, or certain CONNECT or CONNECT:AMP models will receive a Discount Credit equal to 15% off any one (1) regular priced product on sonos.com, with some product restrictions indicated below.”