Specifications:

• Signal transmission mode: multi-frequency pulse
• Signal transmission distance: 3 km
• Receiver: 30mA
• Power supply: 2 x DC 9 V batteries (not included)
• Output signal level: 9Vp-p
• Is Smart Device: yes
• Features 2: Sensitive and adjustable volume control
• Features 1: easy to carry, Comes with headphones,Flexible and versatile interface
• Emitter: 10mA
• Brand Name: xinxiang