The interface standard eliminates the need for brand- or model-specific chargers. Efficiency of China-made units commonly exceeds 70 percent.

Suits big smartphone brands

Frunda (Nanjing) Electronic Technology Co. Ltd
This wireless charger from Frunda works with the iPhone, various Samsung, Nokia and HTC smartphones, and other Qi-enabled devices. Its input current is 5V/2A and output is 5V/1A. Charging efficiency exceeds 70 percent for this 90x8.9mm unit. The CE- and FCC-certified model is housed in ABS with a rubber and polished stainless steel back. It comes in red, white and black. Price is $17 to $30 for an MOQ of 100 units.

Qi 1.1

Shenzhen Bondidea Technology Co. Ltd
The model Vita2 wireless charger from Shenzhen Bondidea uses Qi 1.1 specification. It has a buzzer and an LED that emits blue or green light to indicate charging status. The unit has more than 76 percent charging efficiency and 5V/2A direct output current. It measures 138.5x80.5x8.2mm. Shenzhen Bondidea requires an MOQ of 500 units.

No slips for Samsung Galaxy Note

Shenzhen Fulljion Digital Technology Co. Ltd
The anti-skid design in the middle of OTWCPB01-GL model ensures the Samsung Galaxy Note does not slide or slip during charging. The unit can also be used with other Qi-enabled devices. It adopts a wireless charging smart chip from Texas Instruments and a charging technique that reduces current automatically to 100mA until the device is fully charged to prevent overcharging. The unit emits a buzzing sound that indicates charging status.

Power in a 4,500mAh Li-polymer battery

Shenzhen Koeok Electronic Technology Co. Ltd
This Qi wireless charger from Shenzhen Koeok stores power in a 4,500mAh Li-polymer battery. The KE-506W model suits Samsung’s Galaxy S III and IV, and Note N7100 and N9000, and iPhone 4, 4s, 5, 5c and 5s. The unit measures 124x62x13mm and lasts more than 500 cycles. It has an LED display and four power indicators.

No danger to smartphones

Shenzhen Potato Technology Co. Ltd
Shenzhen Potato offers the PT-W001 model, a wireless charger protected against overcharging, -discharging, -voltage, -current and -loading, and short circuits. The unit suits Samsung, LG, Nokia, LG and HTC smartphones, various “iDevices,” Sony PSP, Nintendo DS, digital cameras and MP3/MP4 players. Priced between $6 and $10 for an MOQ of 100 units, the disk-shaped model comes in black and white.

3-coil wireless charger transmitter pad

Yabo Technology Co. Ltd
Priced $8 to $20, the T513 model from Yabo is a three-coil wireless charger transmitter pad with a charging current of 5V/1A. Its input voltage is 5VDC/2A. The 120x70x10.6mm model works with the iPhone and Samsung, HTC and LG smartphones. The Qi-enabled transmitter pad has a charging efficiency exceeding 70 percent. It comes in black and white. Yabo requires an MOQ of 100 units.