Model Number: HX-877-#1903 Brand Name: OEM Key Specifications/Special Features: Transparent acoustic tube style surveillance earphone received superior sound even in noisy environment, and it’s also discreet and portableChangeable acoustic tube assembly for hygiene and multiple usersClip can secure to user’s lapel to meet their need360-degree revolving back clip can turned by different segments to secure to the user's lapel or collarSpeaker:

OD: Φ16mm

Resistance: 90Ohm±15%

Sound pressure level: 90dB±3dB

Rated power: 100mW

Max power: 20mW

Microphone:

1. Type: electret microphone
2. Sensitivity range: -40dB±3dB at 1000Hz
3. Resistance: 2.2KOhm