This LCD digital wireless is made of for durable and use. It’s very convenient to show the indoor and outdoor temperature. wireless transmission function can allows you to know the outside temperature with internal receiver. Features - - Material: ABS. - With LCD Digital Wireless . - for durable and use. - Lightweight for portable carry. - Show the indoor and outdoor temperature. - Wireless transmission function allows you to know the outside temperature with internal receiver. - Very convenient, a great item for your home or office. Specification - Size: Transmitter Size: 2.60x1.97x0.79 "/ 6.6x5x2cm. Receiver Size: 3.15x2.17x0.67 " / 8x5.5x1.7cm. - Internal temperature measurement: 0 ~ 60 ° C. - Outside temperature measurement: -40 ~ 60 ° C. - Accuracy: (+/-) 1 ° C. - Wireless transmission (outdoor): 100 meters, 30 meters under most state. - Frequency: 433 MHz. - Refresh Rate: 60 seconds. - Transmitter Battery: 2 x 1.5V AAA batteries (not included). - Receiver Battery: 2 x 1.5V AAA batteries (not included). Package list: 1x receiver 1 x Transmitter 1 x User Manual (English)