AnyTone AT-D878UV Operating Manual page 26

(5) Kill
Select Kill, and it will send out a kill signaling to the target radio which will
be killed (No display, no operation) when receiving the signaling and it will
send back a kill successful message to the transmit radio.
(6) Wake
Select Wake, and it will send out a wake signaling to the killed radioand the
target radio will return to standby when it receives this signaling and send
back a Wake successful message to the transmit radio.
(7) Ranging
When caller and reciver both GPS positioned, if the caller turn on ranging
funcion and the receiver is within communication range, both will detect
the relative distance and range between each other.
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6. ADVANCED FEATURES
AT-D87 8UV Digital DMR and Analog UHF/VHF Two Way Radio