If you have any questions about the products and logistics, you can send message to us, we will reply as soon as possible. Thank you for your trust and cooperation. Low-cost, low energy consumption, two alkaline batteries can be used 4 months, Buyers bring their own battery.Control distance: up to 100 meters. Transmitter Power: DC 3V (2 alkaline batteries can be used 4 months). Receiver Power Supply: AC 380V/220V or DC 24V/36V/48V. This items without include battery, because airlines and airplane do not allow. The receiver comes with 1m cable connector.