This item is Bluetooth, however I was looking for one that will connect to my cellphone via Bluetooth but also sync with my gun range app. This item only connects to its only app ONLY!!!

This review is for the HoldPeak HP-866B_WM. I would give it 5 star review except that it reports a bad windspeed value when in mph. If seller corrects this issue I will update this review. Except for this I am very pleased with my purchase.

UPDATE: 10/8/2017. Manufacturer sent me second HP-866B_WM, and it has the same problem with windspeed in MPH. When I told them this, they said they would send the unit back to engineering to fix.

In brief:
PRO: Lots of good measurements. Light, well constructed, and easy to use.
CON: (1) MPH reading is not correct. (2) Difficult to remove battery cover, requires screwdriver. (3) Unit forgets my last selections when powered off.
WORK-AROUND: When I want MPH, I use the approximation that 1 meter/second is about 2 miles/hour, so I double the m/s airspeed reading.

Appearance
The unit I received looks exactly as pictured, with 6 buttons, blue rubberized bumper on left and right. Across the top: red power on/off, Wind, Baro. Across the bottom: Mode, T/RH, Alt.
On backside is the battery cover and a rubber cover over an open rectangular hole. This is where the USB connector would be if this unit had a USB connector (it doesn't have one). Also the unit serial number (mine starts with 20170223 which looks like a datecode probably for the date of manufacture February 23, 2017.
On the bottom is a metal screw spot where you can screw in either a tripod or the supplied hand strap.

Size, weight
Unit measures: width that varies from approximately 2.5" (6.3cm) where you hold it to approx. 3 3/8" (8.3cm) across the widest spot on top. Length is approx. 6 5/8" (16.7cm) top to bottom not counting the strap and its screw. Depth of unit is approx. 1.5" (3.7cm) at deepest spot (by the fan). Unit weighs approx. 5.56oz (157.5g) with batteries and strap attached.

Power
Unit requires 2 AAA batteries, and two come with the unit. Note that the battery cover is screwed in with two Phillips type screws and the cover is difficult to remove. This might be to provide some rain resistance.

Windspeed
The unit reports windspeed in meters/second (m/s), Kilometers/hour (Km/h), feet/minute (ft/min), knots, and miles per hour (mph). I know that my unit's windspeed is reported incorrectly in mph because: weather report says winds about 3 mph; outside, I see windspeed of 5 Km/h but when switch to mph I see 0.3 mph.
Maybe it's a decimal point issue? I'm not sure, so I'm viewing windspeed in meters/second and multiplying by 2 to get a close approximation to miles/hour.

Unit also reports:
Barometric pressure in inches mercury in inHg and hpa mbar.
Temperature (Centigrade and Fahrenheit), relative humidity, and dew point (Centigrade and Fahrenheit).
Altitude in meters and feet. I'm not sure how accurate the altitude is so it might be best to use as a relative measure.

The top display in large letters shows either Windspeed or Barometric pressure. The lower display in smaller letters can display temperature, relative humidity, dew point or altitude along with windspeed or barometric pressure.

The Mode button only has an effect when you are displaying windspeed, and switches the mode from normal (instantaneous windspeed), Max, Min, and Avg (average). Holding down the Mode button for about 3 seconds turns on or off a very nice screen backlight.

When you turn the unit on, it starts with windspeed in m/s and temperature in Centigrade regardless of what display you'd set it to earlier.

Needed an anemometer when adding a hybrid hot water heater exhaust into my HVAC electric system. Worked great. Gave me the specific pressures that I needed from both the hot water heater and my HVAC system. Very happy.

Good for fat readings

The large display is easy to read in the sun.