AS-ABS Sounder UnitManufactured by Nittan, this Nittan Sounder Unit AS ABS is an Addressable Sounder unit, which when used with the UB 4 EV AB base can mount a detector into it for ceiling mounting applications. Alternatively it can be used with Red or White covers for wall mounting applications. Nittan Sounder Unit AS ABS specifications product detail are as follows: Manufacturer: Nittan Part Number: AS ABS Benefits Details of Nittan Sounder Unit AS ABS include: Nittan