Retekess TT109 Long Range Tour Guide System Receivers:1 pc TX + 15 pcs RX There is an ever growing

There is an ever growing demand for filters suitable for extremly fast optical systems like Celestron´s RASA the Epsilon Astrographs made by Takahashi

Multiple keyboards work with the same pagers

Ion source assisted coating technology (IAD)

Line in the recording you can record the playing music

Retekess TT109 Long Range Tour Guide System Receivers:1 pc TX + 15 pcs RX There is an ever growingRetekess TT109 Long Range Tour Guide System Open air transmission distance up to 180 meters One click pairing of all receiver channels 2. 4 GHz signal transmission with stable sound quality Transmitter and receiver can be hung on the neck, freeing your hands Pocket size and light weight, easy to carry. Battery runtime It only takes 2 3 hours to fully charge, the transmitter can work for 8 hrs and the receiver can work for 18 hrs after a full charge.