Electronic Price Tag Smart ESL TFT Screen Display Shelf Label Low Consumption Bluetooth 2.9inBlack White Item Type: Electronic Price Tag Material: ABS Purpose: Electronic price tag Connection Method: Bluetooth Battery Type: 2 x Button batteries in series Battery Model: CR2450 Nominal Battery Capacity: 1240mAh Function: 1. Efficiency: 30 Minutes for less than 20,000 units 2. Success Rate: 100% 3. Transmission Technology: 433 MHz radio frequency. Non interference ability of Wi-Fi devices such as mobile phones. 4. Transmission Range: The coverage range is approx. 30 ~ 50meter / 98.4 ~ 164ft. 5. Display Template: Support dot image display. 6. Working Temperature: Normal label 0℃~40℃, refrigeration environment label -25℃~15℃. 7. Communication and Interaction: Dual wave communication, real time interaction. 8. Product Standby Time: 5 Years, the battery can be replaced. 9. Docking System: Support text, Excel, spreadsheet, intermediate data guide into, user defined development, etc.