AUSTARS RCEXL RCEXL Digital Wireless Mini Tachometer

Specification:
2 It looks fancy and compact in size. Very handy to use.
2 It measures 2-9 blades prop rpm.
2 Multiply the readout by 10 for final rpm reading, it shows 4 digitals in a 10-99.999 rpm range
2 It comes with a replaceable 3v LITHIUM battery.
2 There is an auto shut-off function after five minutes when no signal received.
2 Display and memorize the maximum rpm value.
2 It needs a little electronic power (20uA) when the tachometer is not in use. This depends on battery??s capacity for life of battery