Digital Earplugs MM1000?U KING JIM

Voices can be heard and only noise can be cut.A small microphone built in the earphones collects ambient environment noise and cancels the noise by producing an opposite phase sound.Code:Yes (850mm)Size:FreeNoise Cancel Level: Max -20dBPower Supply: AAA Alkaline Dry Battery (sold separately)Battery Life: Approx. 100 hours when using alkaline dry battery(depending on use conditions)Main body: ABS resin