Slim Walkie Talkie 2 Way Radios 16 Channel Fast Communicate Tool Outdoor. Operation Voltage DC3.7V Channel Capacity 16 Antenna Integrated antenna Antenna Impedance 50 Dimension 96x55x22mm Battery: 2800mah (12 Hour). We will be glad to assist! The item is defective, please notify us within 3 days after receiving the items. That come with the package.We will provide you with a return address. Please note that we are not liable for any consequential losses such as faulty installation by professional or yourself. We're able to provide you with a cheaper wholesale price. We will try our best to resolve the issue for you.