You need any laser safety glasses, not that expensive for Class 2M lasers , but no sun glasses , it do not works with sun glasses .
The prices start at $6
For safety laser glasses for wave length 400 and 700 nanometers (nm),
700 nanometers and up recommend.
Something like that ( don’t buy the small lenses , bigger works better )
MEIGIX Laser Safety Glasses Over Glasses, IPL 200nm-2000nm
Just $4 today Amazon.com: MEIGIX IPL Safety Glasses, 200-2000nm Reliable Absorption Filtering Laser Eye Protection Goggles, Anti-fog, UV400 Protection, OD5+ for IPL Pulsed Light Hair Removal, Beauty therapy : Tools & Home Improvement