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Siemens Gigaset S645

Siemens Gigaset S645
alaScore 81

30 reviews

Dec, 2018

alaTest has collected and analyzed 30 reviews of Siemens Gigaset S645. The average rating for this product is 4.3/5, compared to an average rating of 4.0/5 for other Cordless Phones for all reviews.

We analyzed user and expert ratings, product age and more factors. Compared to other Cordless Phones the Siemens Gigaset S645 is awarded an overall alaScore™ of 81/100 = Very good quality.

Review analysis

(Based on 30 reviews)

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Expert review by : Ampers (

Siemens Gigaset S645 DECT phone system


Is the more expensive Siemens phone all that it is cracked up to be and worth the extra money? Andrew Taylor has used this for three months and now gives his opinion.

This is a mini-review to give you some idea of what you will get, using a high end DECT phone system. Although priced at a little over a hundred pounds, this DECT phone has a tremendous amount going for it. Before getting into the nitty-gritty, let me...

Aug, 2006

Product Specifications

Call Management

Call log entries:10
Calling line identification presentation (CLIP): Yes
Conference call: Yes
Redialing: Yes


Backlight buttons: Yes
Color of product:Silver


Display number of colors:4096 colours
Display number of lines:5
Display Resolution:101 x 80

Energy Management

Battery Technology:Nickel-Metal Hydride (NiMH)
Battery Type:AAA
Standby Time:150
Talk Time:10
USB powered: Yes

Management Features

Alarm clock: Yes
Navigation key: Yes
Voice dialing: Yes


Phonebook capacity:200

Other Features

Alarms:10 polyphonic sounds
Antenna Type:Internal
Dimensions (WxDxH):2.01 x 1.1 x 5.55 / 2.95 x 6.22 x 4.17
Full duplex: Yes
Mac compatibility:No / Yes
VoIP protocols:Y


Answering machine:Y
Integrated answering machine: Yes
Maximum indoor range:1968.5
Maximum outdoor range:11811
Recording Time:25

Phone Features

Multi base capability:4
Multi handset capability:6
Paging function: Yes
Polyphonic ring: Yes
Short Message Service (SMS): Yes
Speakerphone: Yes
VIP group function: Yes
VIP group with own melody: Yes

Ports & interfaces

Plug and Play: Yes
Wireless connection:N / Y
Wireless connections:No / Yes


Battery Technology:Nickel-Metal Hydride (NiMH)
Battery Type:AAA
Standby Time:150
Talk Time:10
USB powered:Y

Weight & Dimensions

Base dimensions:6.22 x 2.95 x 4.17
Handset dimensions (WxDxH):2.01 x 1.1 x 5.55