Why Jaapmala is Important while doing Jaap?

Shastra says that if you do Jaap without Jaapmala it will prove fruitless.
If we use Jaapmala we will have three advantages as below,

1) Mala has 108 bead so we can know exactly no. of our Jaap.

2) Jaapmala is made my Rudraksha or Tulasi which are very sacred if we be in touch with it ; we will also become sacred.

3) By rubbing thumb and fingers a creation of electro power takes place which made our mind fresh and happy.

16 Avataars (Incarnations) of Lord Dattatreya.

As Lord Vishnu Become in 10 incarnations same way for different purpose Lord Dattatreya become in 16 individual incarnation as,

Avatar(Incarnation)	Date as per Hindu Calender
1) Yogiraj	Kartik Shuddha Pournima
2) Atrivarad	Kartik Krushna Pratipada
3) Dattatreya	Kartik Krushna Dvitiya
4) Kaalagnishaman	Margshish Shuddha Chathurdashi
5) Yogijanvallabh	Margshish Shuddha Pournima
6) Lilavishvambhar	Poush Shuddha Pournima
7) Siddharaj	Maagh Shuddha Pournima
8) Dhanyasagar	Falgun Shuddha Dashami
9) Vishvambhar	Chaitra Shuddha Pournima
10) Mayamukt	Vaishakh Shuddha Pournima
11) Mayayukt	Jeshtha  Shuddha Trayodashi
12) Aadiguru	Aashadh Shuddha Pournima
13) Shivaroop	Shravan Shuddha Ashthami
14) Devdev	Bhadrapad Shuddha Chathurdashi
15) Digambar	Ashvin Shuddha Pournima
16) Krushna-shyam-kamalnayan	Kartik Shuddha Dvadashi.

Sapt (7) Paatal.(The under-World)

1) Atal

2) Vital

3) Sutal

4) Talaatal

5) Rasaatal

6) Mahatal

7) Paatal.

Sapt(7) Lok(People)

1) Bhulok(on Earth)
2) Bhuvarlok(Between Earth and Space/Sun)
3) Swarglok(In Swarga)
4) Maharlok
5) Janlok
6) Tapolik
7) Satyalok

Sapt(7) Mokshadayika(Salvation Places)

1) Ayodhya

2) Mathura

3) Maya(Haridvar)

4) Kashi

5) Kanchi

6) Avantika(Ujjayani)

7) Dvaravati.

Sapt Chiranjeev(Son)

1) Ashvatthama


2) Bali


3) Vyas


4) Hanuman


5) Vibhishan


6) Krupacharya


7) Paatal

Sapt (7) Rhishis(Saints)

1) Kashyap

2) Atri

3) Bharadvaj

4) Vishvamitra

5) Gautam

6) Jamadagni

7) Vashistha