Digital Temperature Humidity Wireless Meter Hygrometer Electronic Thermometer In/Outdoor Used with and high quality. This is only used in for the Please purchase it with caution! for itself has a wireless and does not need to be purchased separately. for 3378 supports up to 3 wireless sensors. Wall Mount or Table Stand Wireless Included 433.92MHz transmitting frequency 60 meter transmission in open area Size: 96mm/3.78inch x 50mm/1.97inch x 34mm/1.34inch Battery: 2xAA (not included) Color: As Shown Material: plastic Package Contents: 1 x Temperature Humidity Wireless(Without 2 * AA batteries) 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.