音量控制电路由编程开关、电脑存储放大执行电路构成，可实现报警音量自动控制；
The volume control circuit is composed of a programming switch and a computer storing magnifying executive circuit, and can realize the automatic alarming volume control.
TFS4还有4种不同的声音报警，且音量可调至隔着很大的房间都可以听得很清楚，是一些非常嘈杂工作环境中的理想定时器工具。
The TFS4 has four distinctive alerts with an adjustable volume control that makes it easy to hear from across a large room - making it the ideal timer for noisy work environments.
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