Suono cancellazione rumore in-ear per apparecchi acustici digitali invisibili ricaricabili
Input Noise: ≤28dB. Max sound output:111±5dB. Sound gain: ≥30dB±5dB. 1 x USB charging cable. Inout noise≤32dB. Max sound output≤115±4dB. Full charing in 2~3 hours, working more than 30 hours. 6 x earplugs.