Many of the latest releases support GSM 800, 900, 1,800 and 1,900MHz and use Bluetooth to transmit data. Designs that run on Android 4 OS are currently being produced in greater quantities.

Android 4.1-based smart watch

Guangdong Appscomm Co. Ltd
Guangdong Appscom's Z3-1 model has an 8.9mm-thick case and a 1.54in multipoint touchscreen. The Android 4.1-based smart watch also comes with 4GB RAM and 4GB ROM. It supports WiFi, Bluetooth 4.0 and G-sensor, and is equipped with an FM radio, digital compass and anti-theft alarm.

Supports Bluetooth 3.0

Hansheng Winpower Technology Co. Ltd
The model BW001-1 smart watch from Hansheng Winpower uses Bluetooth 3.0 to send and receive files. The product has a metal case, weighs 80g and doubles as a mobile phone. The unit incorporates an OLED display and features an anti-theft alarm. It also comes with a USB charger, and built-in speaker and microphone.

Multilanguage PIM

Shenzhen Diweinuo Technology Co. Ltd
Shenzhen Diweinuo's ultraslim GD910 model features a multilanguage PIM, including English, Spanish and traditional Chinese. It has a 1.55in 260K TFT touchscreen that supports handwriting and a 2MP CMOS camera. It uses GSM850 and 900, DCS1800 and PCS1900, and supports SMS, MMS and GPRS. The 67x50x12mm 70g watch is also equipped with a MP3/MP4 player, Bluetooth and 64-channel polyphonic ringtone.

1GHz dual-core CPU

Superdigital Technology Co. Ltd
The model SW055 quadband smart watch from Superdigital runs on Android 4.0 and utilizes a 1GHz dual-core CPU. The unit supports GSM 850, 900, 1,800 and 1,900MHz, Bluetooth and WiFi. It has a 240x240 pixel multipoint capacitive touchscreen and a 2MP camera. The product also incorporates MP3/MP4 and video players.

Up to three hours talking time

Watch Mobile Ltd
Watch Mobile offers the multilanguage i5s-Smart Watch Phone model with a 1.8in 256K TFT screen and a talking time of up to three hours. It has 512MB RAM and 4GB ROM. The product supports SMS, MMS, Bluetooth, JPEG, GIF, MP3/MP4 and GPRS, and features a 2MP camera. The 55g 53x39x13mm smart watch is available in different colors.

Heart rate monitor, pedometer functions

Wuhan Qiaoya Broadway Info Tech Co. Ltd
The QE01-SP model from Wuhan Qiaoya Broadway supports GSM 800, 900, 1,800 and 1,900MHz and runs on an MTK processor. It has a 1.49in TFT touchscreen and uses Bluetooth 2.0 to transmit data. The unit doubles as a heart rate monitor and a pedometer, and measures calories burned during exercise. It also supports SMS and GPS, and features one-touch emergency call dialling that can store three sets of phone numbers.