8 repeater

repeater
n (dated 旧)
1 revolver or rifle that can be fired many times without being reloaded 转轮手枪; 连发步枪.
2 watch or clock that can strike the last quarter hour or hour again 打簧表; 打簧钟.
3 device that repeats a signal 转播器; 中继器; 增音机.