ES-01 Audio Details Technical Specifications Earbud without Earpiece (Receive-Only)Reliable and ergonomically designed earbud to be used with various base sets. 3.5mm jack plug.Find a dealerHighlightsFunctionsAccessories for ES-01 Included as standard with ES-01Systems that work with ES-01Technical SpecificationsSpeaker sensitivity 110dB ± 3dB @ 1KHz, rated power 10mW, maximum power 30mW, impedance 32Ω± 15% @1KHz, operating temperature -20° to +60°CRelated Products BD555 PT560H BD305LF BD505