Hi Claudio, Thanks for your inputs. Please find my comments inline. > Is it really necessary? I thought registering a watcher at service > "level" was enough. Yes. I think if we if we have watcher at service level is enough cause having a specific characteristic watcher would not help much. > Could you please explain the relation between this property and > Service Changed characteristic(Generic Attribute Profile Service)? > In my opinion, it is a service property instead of characteristic property. Yes you are correct. ServiceChanged() will do. > Read only? CCC can be writeable right? It's actually "3.3.1.1 Characteristic Properties" from spec. Thanks, Vijay Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom More information can be found at www.csr.com. Follow CSR on Twitter at http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog ��.n��������+%������w��{.n�����{����^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�