Model Number: HX-322-#4026 Brand Name: OEM Key Specifications/Special Features: New design 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-degrees revolving back clip can turned by different segments to secure to the user's lapel or collarSpeaker:

Outer diameter: Φ16mm

Resistance: 90 ohms ±15%

Sound pressure level: 90dB ±3dB

Rated power: 100mW

Max power: 20mW

Microphone:

• Size: 9.7*5.0mm
• Sensitivity: -36dB ±2dB
• Resistance: 2.2K ohms