A warning device of the crutch can automatically give a warning without manually turning a warning switch on as long as the crutch drops on the ground.
拐杖的报警装置不需要人为地打开报警开关，只要掉落在地上，就能自动发出报警声。
A warning device of the crutch can automatically give a warning without manually turning a warning switch on as long as the crutch drops on the ground.
拐杖的报警装置不需要人为地打开报警开关，只要掉落在地上，就能自动发出报警声。
应用推荐