GMRS means General Mobile Radio Service. Users should have a license to use this frequency band. You could opt for this band if you want to speak over a distance of greater than one.25 miles. The ERP allowance of GMRS devices is over and above 2W and approximately 50W. For https://allhealthmarket.com/product/first-aids/walkie-talkie/range/1-5km-3km/4-pcs-baofeng-uv-5r-walkie-talkie-two-way-radio-fm-transceiver-dual-band-dtmf-encoded-vox-alarm-led-flashlight-key-lock/