Product features: The kit has low noise, high sensitivity, strong anti-jamming ability, with curved acrylic shell. Can be external tie rod antenna and insert headphones as antenna, support dual-channel amplifier and headphone audio output. Powered by 2 x AA dry batteries(Not included), easy to use. FM radio made by RDA5807 wireless transceiver chip, working voltage 2.7-3.3V, it can receive broadcasting in 50-108MHz band. Battery power input power supply, POWER for the power switch button, channel +/channel - for the electric tuning button, volume +/lead - for the volume control buttons, can be an external tie rod antenna and plug headphones as an antenna, support for dual-channel amplifier and headphone audio output. Power supply part of the battery as the main power input port, with 3.0V to the radio circuit power supply. u2 wireless transceiver chip using RDA5807, the high-frequency signals into audio signals, with H1 tie rod antenna as an antenna to receive signals. The radio is in manual mode and can cut the station by channel+/channel- electric tuning button. Product name:RDA5807 FM radio kit Product model:WK-56-87 Operating voltage:DC3V DC (2 x AA dry batteries,Not included) Receiving frequency:50-108MHz Antenna length:65mm (extension up to 200mm) Colour:As Shown Material:ABS Size:PCB board size:65x31mm, Acrylic shell size:114x72x39mm Package Contents: 1 * radio set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.