1seg is not digital radio. The RF-U180 specification says that it will cover 1seg UHF channels 13-52. If you have 1seg TV channels between 13-52 it may work. I just do not know as I do not have experience with this radio. There are two other things you need to consider, the power plug on the radio and the voltage it requires. You may need an adapter and or that radio may not work at all with the power system in your country. The RF-U180 does use batteries as well.
ワンセグTV音声-FM-AM 3バンドレシーバー:RF-U180TV●「ワンセグTV音声」と「ワイドFM/AM」が楽しめる。●10cm大型スピーカーと「音質切替」機能で聴き取りやすい。●大型ディスプレイと「ダイレクト選局キー」で操作がかんたん。
panasonic.jp
I have not used 1seg TV for quite some time. I previously did while living in Japan. I used a Sony PSP and a 1seg tuner that attached to the PSP. It worked very well for me. When driving around, the 1seg TV in my girlfriends car would sometimes cut out when we were in the city center of Tokyo with many buildings that blocked the signal. If you have a Sony PSP you can easily find the 1seg tuner at a lower price than the RF-U180. If you have a Nintendo DS, there is also a 1seg tuner for that device as well.