1. Indoor temperature detection range: -9.9°C-60°C (14.18℉-140℉) 2. Indoor humidity detection range: 10%-99%RH 3. Outdoor temperature detection range: -40°C-60°C (-40℉-140℉) 4. Temperature unit [°C/℉] can be switched 5. Wireless transmission distance: 100 meters in open space Record the maximum and minimum values within 24 hours Low battery reminder The back of the receiver has a support frame for placement and a hanging hole for wall hanging. The back of the transmitter has a hanging hole for wall hanging Screen size: 2.56 inches Due to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal use Colour:White Material:ABS Size:8x4.5x11cm Package Contents: 1 x Receiver(Does not come with 2xAAA batteries, you need to prepare them yourself) 2 x Transmitter(Does not come with 4 x AAA batteries, you need to prepare them yourself) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.