Outdoor use professional Digital two way Radio (DMR) DM-680 Portable Type General Specification ModelDM-680Channels512Zones16Frequency Rang400-480MHzAntenna Impedance50ΩDimension97×58×40mmWeight270gLi-ion battery2300mAhRated voltageDC: 704VBattery: The average battery life under 5/5/90 duty cycle,Website:http://www.kydera-dmr.com, and using carrier squelch and TX high power.Receiver ...