Is Helium Wallet secure?

Could you please elaborate on the security measures employed by the Helium Wallet? I'm considering using it to store my cryptocurrencies, but I'm quite concerned about the safety of my assets. What kind of encryption does it use? Are there any known vulnerabilities or hacks that have occurred in the past? Does it provide multi-factor authentication for added protection? Additionally, how does it handle private key management? Is it possible to recover funds in case of a lost or stolen device? I'd appreciate it if you could provide a comprehensive overview of the Helium Wallet's security features. Thank you in advance for your assistance.