ES-02 Audio Details Technical Specifications Earbud with Acoustic Tube (Receive-Only)Reliable and ergonomically designed earpiece with acoustic tube to be used with various base sets. 3.5mm jack plug.Find a dealerHighlightsFunctionsAccessories for ES-02 Included as standard with ES-02Systems that work with ES-02Technical SpecificationsSpeaker Sensitivity 117dB ± 3dB @ 1KHz, rated power 10mW, maximum power 30mW, impedance 90Ω± 15% @1KHz, operating temperature -20° to +60°CRelated Products PD668 UL913 PT580H Plus UL913 BD558 PD988 UL913