Connect your 4K source to your 4K TV and distribute the contennt via RF to other TVs in 1080p resolution.      

User Manual is here

Specifications

Video:                          HDMI 2.0
Video System:             480i/p, 576i/p, 720p,1080i/p,
                                    4K(3840x2160 or 4092x2160)
Audio:                          HDMI
Type:                           1 Multiplex DVB-T with a digital TV service

Modulation
Standard:                   DVBT (ETSI EN 300 744)
Constellation:             QPSK, 16QAM, 64QAM
Guard Interval:           1/4, 1/8, 1/16, 1/32
Code Rate:                1/2, 2/3, 3/4, 5/6, 7/8
FFT Carrier Mode:     2K, 8K
Bandwidth:                6MHZ, 7MHz, 8MHz,  7-8MHz
‧Frequency:              177 to 858 MHz
‧MER:                          > 30dB
‧Output level:             95 dBuV Max
‧RF Level Adj:            0 dB to -30dB
‧Attenuation step:     1dB per step

Encoding
Video:                         H.264 Baseline Profile Level 4.0
Video Resolution:      1080p 25 / 30 Max
Video Bit rate:           12 Mbps Max.
Audio:                         MPEG-2 / AAC
Audio Bit rate:           192 Kbit/s
DVB insertion tables: SDT,NIT
Editable field:              SERVICE NAME , Network Name , Provider
                                   Name , TS ID , NETWORK ID , ORIGINAL NET
                                   ID , LCN , NIT VERSION , PRIVATE DATA , Country

Connections
HDMI IN:                     HDMI IN
HDMI OUT:                4K PASS THROUGH
RF Output:                 1 DVBT RF output
RF Input:                     RF Combiner
Power:                        100 to 240V 50/60Hz 12V 1.5A ADAPTOR
Display:                       LCD panel @ 2 x 16 characters
Adjustment:               6 Local keys on front panel
                                     OK Key : Select parameter, or menu
                                     L / R Keys  : Move menu, or characters
                                     Up / down : Select value of the figure, or field.
                                     Menu keys : Select menu

General
Temperature:             5deg C to 40 deg C
Relative Humidity:    80% @ 30 deg C
Weight :                      1.5Kg
Size:                            160mm x 100mm x 35mm