Features:
Built-in sounder, clear voice, save electricity.Wear nature and comfortable, will not oppress the ear.

Technical Parameters:
* Max Out : 130 ± 4dB
* Max Gain : 48 ± 5dB
* Harmonic Dist: ≤ 5%
* Frequency Range : 450Hz ~ 3500Hz
* Equivalent Input Noise : ≤ 32 dB
* Standard Battery: AG13
* Voltage: 1.5V
* Current: ≤ 3mA

Specification:
Product Weight: 8g
Product Size: 4.6*3.8*0.9cm
Packing details: Paper+Plastic box
Packing Size: 12*8.5*3.2cm
Q.T.Y/Carton: 120PCS
Carton Size: 52.5*31*39cm
GW: 11Kg
NW: 9Kg