Time Control Switch Guide Rail Type School Factory Ring Bell Switch Relay AC220V 3A

Feature: 1. The timer switch can be used for school bell or factory bell. 2. Guide rail mounting design is convenient for installation. 3. The bell ringing time can be set from 1s to 99s. 4. Low error,only 1sday error in working,and the minimum setting time is 1min. 5. With a builtin button cell ML621 which dose not require replacement. Specification: Item Type:Timer Switch Minimum Setting Time: 1min Timing Error: less than 1sD Thermally Stable Current Value: 16A Ringing Time: 1s~99s Installation Method: Rail Type BuiltIn Battery: Rechargeable Button Battery ML621, No Need to Replace. Package List: 1 x Timer Switch1 x English Users ManualThe timer switch can be used for school bell or factory bell. Guide rail mounting design is convenient for installation. The bell ringing time can be set from 1s to 99s. Low error,only 1sday error in working,and the minimum setting time is 1min. With a builtin button cell ML621 which dose not require replacement.