Product USES around a track two way audio output to meet the special needs of customers.
Tiny patch design, high fidelity, sound quality is clear.
Listening range: 5-50 square meters.
The performance parameters
Voltage: linear power supply (transformer) 9-12 v dc
Current power consumption: 18 ma
Non equilibrium output impedance: 600 ohms
Attachment: red (DC) white (RCA), yellow (RCA)
Apply to hai kang, dahua, chamberlain overseas video recorder