MX-3000 Features/Specifications:  

Size: 8 " x 2.25" x 1.25" (L x W x H)
Weight: 14oz (with batteries)
Learning Capabilities: Up to 255 steps each, however nesting is allowed
Macro Capabilities: Standard frequencies
(15kHz to 460kHz)
RF Freq: 418 MHZ
Range: RF - Up to 100 feet when used with MRF-250 or MRF-300 RF Base stations
IR (line of sight) - Up to 50 feet, depending upon environment
Power Supply: Four (4) AAA batteries (included)
Warranty: 1 year parts & labor when purchased from an authorized dealer

MX-650 Features/Specifications:

LCD Screen Size: 1.4" x 2.1"
Range: RF - Up to 100 feet when used with MRF-250 of MRF-300 RF Base station, IR (line of sight) - Up to 60 feet with fresh batteries.
Batteries: MX-650 - 4 AAA alkaline (included)
Dimensions: MX-650 - 9.0" x 3.0" x 1.3" (L x W x H)
Weight: MX-650 - 8oz (with batteries)
Warranty: 1 year parts & labor when purchased from an authorized dealer

MX-850 Features/Specifications:

LCD Screen Size: 1.4" x 2.1"
Range: RF - Up to 100 feet when used with MRF-250 or MRF-300 RF Base stations, IR (line of sight) - Up to 60 feet with fresh batteries.
Batteries:MX-850 - 4 AAA alkaline (included)
Dimensions: MX-850 - 9.0" x 3.0" x 1.3" (L x W x H)
Weight: MX-850 - 8oz (with batteries)
Warranty: 1 year parts & labor when purchased from an authorized dealer