Td162 supports the expansion of 998 pages, which can help solve the problem of long queues and crowded customers.
Using ABS high-strength material, wear-resistant and scratch-resistant; strong and stable fall resistance.
Each buzzer has a built-in 300 mA battery, which can be used for 20 hours.
Can reach 400 meters in open space, but the actual distance may be affected by the environment.