"BF-888S" the "20 Euro-UHF-WalkieTalkie"
---- under construction ----
for English Manual see 
Rem.: Possible are also channel spacings less than 25KHz, like e.g.
6.25KHz as needed for 446MHz PMR
INSIDE BF-888S: main board mounted on heatsink
BF-888S: main board : component
part of BF-888S is two way radio chip "BK4810" from BEKEN Corporation
in China . Detailed specs
on this chip could not be found, but it must be quite similar to
version "BK4800" ( but without some additional functions like e.g. FSK
modem ) as described here with more details:
BF-888S: general function block
Radio chip "BK4810" and
MCU "B86F88H" inside radio "BF-888S" DEFAULT CHANNELS "OUT OF THE BOX"
In most cases operating these frequencies would be against national
Supposely legal use only is possible for licensed radio hams within
70cm amateur band.
( I guess also using PMR446 channels [ 446.0-446.1 MHz ] would be
ADAPTORS FOR PROGRAMMING AND
For programming i did use a standard USB<>RS232 cable and home
made adaptor according to circuit from PA3FYM like shown above.
Suitable software can be found under  and 
Pinning for external Speaker and Mic ( like also be used for e.g.
Radios ) LINKS