Dimensions: 82 x 41 x 10mm(L×W×H); Weight: 28g (inclusive of battery). TN Display LCD, 13.6 x 14.5mm; Display: English, Number, Icon; Status icons to indicate signal strength, communication status and battery level. Simple six-button design (1/A- 5/E, SEND). Battery & Replacement: two coin cell CR2032, replaceable; Battery life >150h; Standby Time >200h. Adopt international two way RF 2.4GHz digital communication technology; 80 RF channels support multiple room setups without interference; RF power <1mW(0dBm); The signal distance is a 50-meter radius circle.