Model QP-123A: Duplicates Micro+Std.Cassette to 3 Std.Cassettes @ 8X&16X Speed.

Model QP-121A: Duplicates Micro + Std.Cassette to 1 Std.Cassette @ 8X normal Speed

Model QP-SSC4A: Duplicates Micro& Std. Cassette to 1 Std.Cassette @4X Speed.

Economy Model QP-ISSC2/4A: Duplicates Micro to Std Cassette @2X Speed & Standard to Standard cassette @4X normal Speed.

Model QP-SS4A: Duplicates Micro to Microcassette up to 8X Normal Speed.

Economy Model: QP-CC2A Duplicates Micro to Microcassette 1 copy 2X Speed.

Model QP-IS4SC4A: Duplicates in all 4 Modes w/quick switching: 1 copy, 4X normal speed

Model QP-4SC2/4A: Duplicates 4 Modes, 1 copy, Std./Std. 4X Normal Speed & all Micros at 2X. The model QP-IS4SC2/4A Duplicates 4 Mode W/quick Switching.

Model QP-SC2A: Duplicates Microcassette to Standard Cassette at 2X normal speed.

QP-SCC2A, 2 Modes,Micro to Microcassette & Micro to Standard Cassette Duplicator...... QP-ISCC2A, switchable version of same unit.................................................................... QP-BSC2A, Micro to Standard & Standard to Micro,

Model: QP-NT2 Duplicates NTC Tapes from NT2 recorders to 1 or 2 Standard Cassettes

Model: QP-RD1S Duplicates SONY BM 246 Courtroom/Conference 4 track tapes

Model QP-MD3: Modified SONY Mini Disk Cabled Remote Control & Cabled Mic Recorder

Model QP-SUB10: 3 hour SILENT STOP Modified Micro Cassette recorder.

Model QP-330DS DIGITAL RECORDER: 16MB of built-in memory allows for more than 5 hours of uninterrupted recording With CABLED REMOTE CONTROL SWITCH & Cabled Mic

Model: QP-KMP : Ultra-Sensitive Pill-Battery-Powered Microphone.

Model: QP-DKU : Stereo Phantom Powered Micro-Miniature Mike.

Model: QP-KM9 : Line-Level Output Mike. Ultra-Sensitive, Select 3V, 6V, 9V, 12V

Model: QP-SOKC : Lock-on Hi-Sensitivity Phantom Powered Microphone.

Model QP-SOK : Lock-on Hi-Sensitivity Phantom Powered Microphone.