In-ear. (Suitable also for PDA earphone, PC earphone and two-way radio earphone).
1. Speaker: (1) Frequency response: 20~20000Hz. (2) Sensitivity: 105+/-3dB. (3) Impedance: 32(ohm)+/-15% at 1kHz. (4) Max Input: 10mw. 2. Microphone: (1) Frequency response: 50~20000Hz. (2) Sensitivity: -58+/-2dB F=1kHz P=1Pa. (3) Rated: DC4.5V. (4) Min operation voltage: DC1.0V.
Convenient, light, and clear communication.