In addition to the SL610H there are only two other handsets in the PRO-series: The R630H is a rugged outdoor or workshop unit and rather less thought for an office environment. As a cheaper twin of SL610H there is the S510H, where SL stands at Gigaset for the upper class and "S" for the upper middle class. The twins look alike to confuse and also the data sheets show next to the battery life, no differences. Only if you look closely, you realize that the SL610H is somewhat smaller and high quality, but it is equipped with a proprietary Li-Ion battery, whereas the S510H uses normal AAA round cells, which are very easy to replace when the power eventually subsides. In addition, the SL610H features as opposed to S510H also features a vibrating alert. As the SL610H can S510H 500 contacts in the Address Book, has a two-way speakerphone, Bluetooth for vCard transfer and headset mode and a headset connection cable with 2.5 mm jack, which is why many smart phone headsets fit only with an adapter. The display is in color and illuminated. With the box are a power adapter, a charger, a belt clip and a Li-Ion battery.
The resolution of the display is much higher than expected, it is a very fine writing. The range is very good and I would rate the call quality as well, which is in the background throughout less noisy than the S510H. The headset mode via Bluetooth works total super, even switching between headset and handset and back during a conversation is not a problem. The PC software QuickSync can update the firmware from the handset, but not directly manage contacts only synchronize with Outlook, for example, is possible. Better yet, of course, the bases of Gigaset had a central telephone book with the web interface as the Fritz boxes, but this I had already expressed during the review of the N510 IP base. Unfortunately, the SL610H can not be different from the S510H, it falls immediately to. Who his phone like hinstellt, for example, to the display when using a headset to keep in mind, should better pick up the S510H.
To conclude that the SL610H is a good phone with a long range, very long term, very good-quality appearance and call quality. Compared to the S510H it offers vibration alarm, is much more compact and lighter and has other ringtones. This aspect can be annoying if you already have an S510H and to ring all handsets with the same ring tone. A couple of ringtones can be found, on both devices, but these are not just the most beautiful ringtones - I think.